Fix typo in DPLL file name

DIRECTORY.md

@@ -65,7 +65,9 @@
 
 ## Boolean Algebra
   * [And Gate](boolean_algebra/and_gate.py)
+  * [Imply Gate](boolean_algebra/imply_gate.py)
   * [Nand Gate](boolean_algebra/nand_gate.py)
+  * [Nimply Gate](boolean_algebra/nimply_gate.py)
   * [Nor Gate](boolean_algebra/nor_gate.py)
   * [Not Gate](boolean_algebra/not_gate.py)
   * [Or Gate](boolean_algebra/or_gate.py)
@@ -178,7 +180,9 @@
 ## Data Structures
   * Arrays
     * [Equilibrium Index In Array](data_structures/arrays/equilibrium_index_in_array.py)
+    * [Find Triplets With 0 Sum](data_structures/arrays/find_triplets_with_0_sum.py)
     * [Median Two Array](data_structures/arrays/median_two_array.py)
+    * [Pairs With Given Sum](data_structures/arrays/pairs_with_given_sum.py)
     * [Permutations](data_structures/arrays/permutations.py)
     * [Prefix Sum](data_structures/arrays/prefix_sum.py)
     * [Product Sum](data_structures/arrays/product_sum.py)
@@ -398,6 +402,7 @@
 
 ## Financial
   * [Equated Monthly Installments](financial/equated_monthly_installments.py)
+  * [Exponential Moving Average](financial/exponential_moving_average.py)
   * [Interest](financial/interest.py)
   * [Present Value](financial/present_value.py)
   * [Price Plus Tax](financial/price_plus_tax.py)
@@ -433,8 +438,7 @@
   * [Breadth First Search Shortest Path](graphs/breadth_first_search_shortest_path.py)
   * [Breadth First Search Shortest Path 2](graphs/breadth_first_search_shortest_path_2.py)
   * [Breadth First Search Zero One Shortest Path](graphs/breadth_first_search_zero_one_shortest_path.py)
-  * [Check Bipartite Graph Bfs](graphs/check_bipartite_graph_bfs.py)
-  * [Check Bipartite Graph Dfs](graphs/check_bipartite_graph_dfs.py)
+  * [Check Bipatrite](graphs/check_bipatrite.py)
   * [Check Cycle](graphs/check_cycle.py)
   * [Connected Components](graphs/connected_components.py)
   * [Deep Clone Graph](graphs/deep_clone_graph.py)
@@ -572,25 +576,20 @@
   * [Arc Length](maths/arc_length.py)
   * [Area](maths/area.py)
   * [Area Under Curve](maths/area_under_curve.py)
-  * [Armstrong Numbers](maths/armstrong_numbers.py)
-  * [Automorphic Number](maths/automorphic_number.py)
   * [Average Absolute Deviation](maths/average_absolute_deviation.py)
   * [Average Mean](maths/average_mean.py)
   * [Average Median](maths/average_median.py)
   * [Average Mode](maths/average_mode.py)
   * [Bailey Borwein Plouffe](maths/bailey_borwein_plouffe.py)
   * [Base Neg2 Conversion](maths/base_neg2_conversion.py)
   * [Basic Maths](maths/basic_maths.py)
-  * [Bell Numbers](maths/bell_numbers.py)
   * [Binary Exp Mod](maths/binary_exp_mod.py)
   * [Binary Exponentiation](maths/binary_exponentiation.py)
   * [Binary Exponentiation 2](maths/binary_exponentiation_2.py)
   * [Binary Multiplication](maths/binary_multiplication.py)
   * [Binomial Coefficient](maths/binomial_coefficient.py)
   * [Binomial Distribution](maths/binomial_distribution.py)
   * [Bisection](maths/bisection.py)
-  * [Carmichael Number](maths/carmichael_number.py)
-  * [Catalan Number](maths/catalan_number.py)
   * [Ceil](maths/ceil.py)
   * [Chebyshev Distance](maths/chebyshev_distance.py)
   * [Check Polygon](maths/check_polygon.py)
@@ -623,10 +622,7 @@
   * [Gcd Of N Numbers](maths/gcd_of_n_numbers.py)
   * [Germain Primes](maths/germain_primes.py)
   * [Greatest Common Divisor](maths/greatest_common_divisor.py)
-  * [Hamming Numbers](maths/hamming_numbers.py)
   * [Hardy Ramanujanalgo](maths/hardy_ramanujanalgo.py)
-  * [Harshad Numbers](maths/harshad_numbers.py)
-  * [Hexagonal Number](maths/hexagonal_number.py)
   * [Integration By Simpson Approx](maths/integration_by_simpson_approx.py)
   * [Interquartile Range](maths/interquartile_range.py)
   * [Is Int Palindrome](maths/is_int_palindrome.py)
@@ -636,7 +632,6 @@
   * [Joint Probability Distribution](maths/joint_probability_distribution.py)
   * [Juggler Sequence](maths/juggler_sequence.py)
   * [Karatsuba](maths/karatsuba.py)
-  * [Krishnamurthy Number](maths/krishnamurthy_number.py)
   * [Kth Lexicographic Permutation](maths/kth_lexicographic_permutation.py)
   * [Largest Of Very Large Numbers](maths/largest_of_very_large_numbers.py)
   * [Least Common Multiple](maths/least_common_multiple.py)
@@ -661,14 +656,12 @@
   * [Numerical Integration](maths/numerical_integration.py)
   * [Odd Sieve](maths/odd_sieve.py)
   * [Perfect Cube](maths/perfect_cube.py)
-  * [Perfect Number](maths/perfect_number.py)
   * [Perfect Square](maths/perfect_square.py)
   * [Persistence](maths/persistence.py)
   * [Pi Generator](maths/pi_generator.py)
   * [Pi Monte Carlo Estimation](maths/pi_monte_carlo_estimation.py)
   * [Points Are Collinear 3D](maths/points_are_collinear_3d.py)
   * [Pollard Rho](maths/pollard_rho.py)
-  * [Polygonal Numbers](maths/polygonal_numbers.py)
   * [Polynomial Evaluation](maths/polynomial_evaluation.py)
   * Polynomials
     * [Single Indeterminate Operations](maths/polynomials/single_indeterminate_operations.py)
@@ -679,8 +672,6 @@
   * [Prime Sieve Eratosthenes](maths/prime_sieve_eratosthenes.py)
   * [Primelib](maths/primelib.py)
   * [Print Multiplication Table](maths/print_multiplication_table.py)
-  * [Pronic Number](maths/pronic_number.py)
-  * [Proth Number](maths/proth_number.py)
   * [Pythagoras](maths/pythagoras.py)
   * [Qr Decomposition](maths/qr_decomposition.py)
   * [Quadratic Equations Complex Numbers](maths/quadratic_equations_complex_numbers.py)
@@ -706,6 +697,23 @@
   * [Sin](maths/sin.py)
   * [Sock Merchant](maths/sock_merchant.py)
   * [Softmax](maths/softmax.py)
+  * [Solovay Strassen Primality Test](maths/solovay_strassen_primality_test.py)
+  * Special Numbers
+    * [Armstrong Numbers](maths/special_numbers/armstrong_numbers.py)
+    * [Automorphic Number](maths/special_numbers/automorphic_number.py)
+    * [Bell Numbers](maths/special_numbers/bell_numbers.py)
+    * [Carmichael Number](maths/special_numbers/carmichael_number.py)
+    * [Catalan Number](maths/special_numbers/catalan_number.py)
+    * [Hamming Numbers](maths/special_numbers/hamming_numbers.py)
+    * [Harshad Numbers](maths/special_numbers/harshad_numbers.py)
+    * [Hexagonal Number](maths/special_numbers/hexagonal_number.py)
+    * [Krishnamurthy Number](maths/special_numbers/krishnamurthy_number.py)
+    * [Perfect Number](maths/special_numbers/perfect_number.py)
+    * [Polygonal Numbers](maths/special_numbers/polygonal_numbers.py)
+    * [Pronic Number](maths/special_numbers/pronic_number.py)
+    * [Proth Number](maths/special_numbers/proth_number.py)
+    * [Ugly Numbers](maths/special_numbers/ugly_numbers.py)
+    * [Weird Number](maths/special_numbers/weird_number.py)
   * [Square Root](maths/square_root.py)
   * [Sum Of Arithmetic Series](maths/sum_of_arithmetic_series.py)
   * [Sum Of Digits](maths/sum_of_digits.py)
@@ -721,9 +729,7 @@
   * [Twin Prime](maths/twin_prime.py)
   * [Two Pointer](maths/two_pointer.py)
   * [Two Sum](maths/two_sum.py)
-  * [Ugly Numbers](maths/ugly_numbers.py)
   * [Volume](maths/volume.py)
-  * [Weird Number](maths/weird_number.py)
   * [Zellers Congruence](maths/zellers_congruence.py)
 
 ## Matrix
@@ -747,6 +753,7 @@
   * [Spiral Print](matrix/spiral_print.py)
   * Tests
     * [Test Matrix Operation](matrix/tests/test_matrix_operation.py)
+  * [Validate Sudoku Board](matrix/validate_sudoku_board.py)
 
 ## Networking Flow
   * [Ford Fulkerson](networking_flow/ford_fulkerson.py)
@@ -773,7 +780,7 @@
 ## Other
   * [Activity Selection](other/activity_selection.py)
   * [Alternative List Arrange](other/alternative_list_arrange.py)
-  * [Davisb Putnamb Logemannb Loveland](other/davisb_putnamb_logemannb_loveland.py)
+  * [Davis Putnam Logemann Loveland](other/davis_putnam_logemann_loveland.py)
   * [Dijkstra Bankers Algorithm](other/dijkstra_bankers_algorithm.py)
   * [Doomsday](other/doomsday.py)
   * [Fischer Yates Shuffle](other/fischer_yates_shuffle.py)
@@ -822,6 +829,7 @@
   * [Rms Speed Of Molecule](physics/rms_speed_of_molecule.py)
   * [Shear Stress](physics/shear_stress.py)
   * [Speed Of Sound](physics/speed_of_sound.py)
+  * [Speeds Of Gas Molecules](physics/speeds_of_gas_molecules.py)
 
 ## Project Euler
   * Problem 001
@@ -1212,6 +1220,7 @@
   * [Capitalize](strings/capitalize.py)
   * [Check Anagrams](strings/check_anagrams.py)
   * [Credit Card Validator](strings/credit_card_validator.py)
+  * [Damerau Levenshtein Distance](strings/damerau_levenshtein_distance.py)
   * [Detecting English Programmatically](strings/detecting_english_programmatically.py)
   * [Dna](strings/dna.py)
   * [Edit Distance](strings/edit_distance.py)
@@ -1246,6 +1255,7 @@
   * [String Switch Case](strings/string_switch_case.py)
   * [Strip](strings/strip.py)
   * [Text Justification](strings/text_justification.py)
+  * [Title](strings/title.py)
   * [Top K Frequent Words](strings/top_k_frequent_words.py)
   * [Upper](strings/upper.py)
   * [Wave](strings/wave.py)