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Add notes from Java 15th release
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‎15/README.md

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# [Java 15](https://docs.oracle.com/en/java/javase/15/) [Release Notes Documentation](https://www.oracle.com/java/technologies/javase/15-relnotes.html)
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## [Release Notes](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html)
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### New Features and Enhancements
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*core-libs/java.lang*
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#### [Added `isEmpty` Default Method to CharSequence](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8215401)
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*core-libs/java.lang*
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#### [Support for Unicode 13.0](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8239383)
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*core-libs/java.lang.invoke*
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#### [JEP 371 Hidden Classes](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8238358)
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*core-libs/java.net*
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#### [Added Support for SO_INCOMING_NAPI_ID Support](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8243099)
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*core-libs/java.util:collections*
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#### [Specialized Implementations of TreeMap Methods](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8176894)
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*core-svc/javax.management*
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#### [Added Ability to Configure Third Port for Remote JMX](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8234484)
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*core-svc/tools*
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#### [New Option Added to `jstatd` for Specifying RMI Connector Port Number](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8196729)
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#### [New Option Added to jcmd for Writing a gzipped Heap Dump](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8237354)
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*tools/javac*
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#### [JEP 378 Text Blocks](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8236934)
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*hotspot/svc-agent*
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#### [New Options Added to `jhsdb` for `debugd` Mode](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8196751)
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*install/install*
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#### [Oracle JDK Installer for Windows Provides Executables (javac, etc) in a Path Reachable From Any Command Prompt](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8222383)
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*security-libs/java.security*
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#### [Added Revocation Checking to jarsigner](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8242060)
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#### [Tools Warn If Weak Algorithms Are Used](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8172404)
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*security-libs/javax.crypto*
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#### [SunJCE Provider Supports SHA-3 Based Hmac Algorithms](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8172680)
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*security-libs/javax.net.ssl*
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#### [New System Properties to Configure the TLS Signature Schemes](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8242141)
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#### [Support for certificate_authorities Extension](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8206925)
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*security-libs/org.ietf.jgss:krb5*
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#### [Support for canonicalize in krb5.conf](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8239385)
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#### [Support cross-realm MSSFU](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8005819)
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### Removed Features and Options
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*core-libs/java.net*
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#### [Removal of Terminally Deprecated Solaris-specific SO_FLOW_SLA Socket Option](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8244582)
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*core-libs/java.rmi*
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#### [Removal of RMI Static Stub Compiler (rmic)](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8225319)
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*core-svc/javax.management*
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#### [Removal of Deprecated Constant RMIConnectorServer.CREDENTIAL_TYPES](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8213222)
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*core-libs/jdk.nashorn*
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#### [Removal of Nashorn JavaScript Engine](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8236933)
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*hotspot/gc*
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#### [Obsolete -XXUseAdaptiveGCBoundary](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8228991)
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*security-libs/java.security*
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#### [Removal of Comodo Root CA Certificate](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8225069)
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#### [Removal of DocuSign Root CA Certificate](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8225068)
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*security-libs/javax.net.ssl*
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#### [Retired the Deprecated SSLSession.getPeerCertificateChain() Method Implementation](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8241039)
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#### [Removal of com.sun.net.ssl.internal.ssl.Provider Name](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8219989)
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### Deprecated Features and Options
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*core-libs/java.rmi*
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#### [Deprecated RMI Activation for Removal](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8245068)
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*docs*
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#### [Deprecated NSWindowStyleMaskTexturedBackground](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8240995)
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*hotspot/gc*
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#### [Deprecated -XXForceNUMA Option](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8243628)
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*hotspot/runtime*
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#### [Disabled Biased-locking and Deprecated Biased-locking Flags](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8231264)
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*security-libs/javax.crypto*
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#### [Disabled Native SunEC Implementation by Default](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8237219)
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*security-libs/jdk.security*
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#### [Added forRemoval=true to Previously Deprecated ContentSigner APIs](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8242260)
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### Other notes
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*client-libs*
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#### [Workaround for Windows GDI API's memory restrictions](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8240654)
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*client-libs/java.awt*
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#### [java.awt.Robot.delay() Method Completes With Interrupt Status Set When Interrupted](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8210231)
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*core-libs/java.io:serialization*
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#### [Improved Serialization Handling](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8234836)
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*core-libs/java.lang*
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#### [Optimized Empty Substring Handling](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8240094)
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*core-libs/java.lang.invoke*
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#### [LookupdefineClass Links the Class](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8238195)
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*core-libs/java.net*
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#### [DatagramSocketdisconnect Allows an Implementation to Throw UncheckedIOException](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8235783)
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#### [java.net.HttpClient Does Not Override Protocols Specified in SSLContext Default Parameters](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8239594)
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#### [Filtering and Ordering of Addresses Returned by Alternative Hosts File Name Service Provider](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8244958)
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#### [DatagramPacket.getPort() Returns 0 When the Port Is Not Set](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8237890)
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*core-libs/java.nio.charsets*
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#### [Modified the MS950 charset Encoder's Conversion Table](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8232161)
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*core-libs/java.text*
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#### [Support Monetary Grouping Separator in DecimalFormat/DecimalFormatSymbols](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8227313)
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*core-libs/java.time*
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#### [`localizedBy()` Overrides Localized Values With Default Values](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8244245)
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#### [ValueRange.of(long, long, long) Does Not Throw IAE on Invalid Inputs](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8239520)
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*core-libs/java.util.jar*
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#### [Performance Improvement for InflaterOutputStream.write](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8242848)
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*core-libs/java.util.regex*
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#### [Incorrect behavior matching Unicode linebreaks](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8258259)
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#### [Case Insensitive Matching Doesn't Work Correctly for Some Character Classes](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8214245)
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*core-libs/java.util:collections*
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#### [Better Listing of Arrays](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8231800)
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#### [`TreeMap.computeIfAbsent` Mishandles Existing Entries Whose Values Are `null`](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8259622)
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*core-libs/java.util:i18n*
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#### [Support for CLDR version 37](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8239480)
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#### [Localized Time Zone Name Inconsistency Between English and Other Locales](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8236548)
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*tools/jpackage*
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#### [[macos] Support for Notarizing jpackage app-image and dmg](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8237490)
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*hotspot/compiler*
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#### [Flags Controlling C1 Inlining Have New Name](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8235673)
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*hotspot/gc*
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#### [Improved Ergonomics for G1 Heap Region Size](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8241670)
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#### [JEP 377 ZGC A Scalable Low-Latency Garbage Collector (Production)](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8209683)
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#### [Disabling large pages on Windows](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8245000)
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#### [Disabling NUMA Interleaving on Windows](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8245002)
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*hotspot/runtime*
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#### [Field Layout Computation Changed](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8237767)
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#### [Enable ShowCodeDetailsInExceptionMessages by default](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8233014)
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*security-libs/java.security*
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#### [Signature and SignatureSpi Get Parameter Methods May Return null When Unsupported](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8243424)
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*security-libs/javax.crypto:pkcs11*
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#### [SunPKCS11 Initialization With NSS When External FIPS Modules Are in Security Modules Database](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8238555)
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*security-libs/javax.net.ssl*
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#### [Default SSLEngine Should Create in Server Role](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8237474)
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*tools/javac*
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#### [JEP 375 Pattern Matching for instanceof (Second Preview)](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8235186)
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*tools/javadoc(tool)*
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#### [Standard Doclet Index Files Compression](https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8237909)

‎README.md

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### [Java 12](./12)
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### [Java 13](./13)
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### [Java 14](./14)
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### [Java 15](./15)
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## Useful readings
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