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<prog> ::= \dots `:\\n' <stat-list>

<stat-list> ::= <statement> <stat-list> | <return>

<statement> ::= <ide> `=' <expr> `\\n' 1

<return> ::= `return' <expr> `\\n' 2

<expr> ::= `if' <expr> <comparator> <expr> `then' <expr> `else' <expr> `fi' 3
	| <expr> `+' <term> 4
	| <expr> `-' <term> 5
	| <term> 6
	
<term> ::= <factor> `*' <term> 7
	| <factor> `/' <term> 8
	| <factor> 9
	
<factor> ::= <expr> `**' <num> 10
	| `(' <expr> `)' 11
	| <ide> 12
	| <num> 13
	
<comparator> ::= `<' | `<=' | `==' | `>=' | `>'

<num> ::= `d' <num> | `d' 14

<ide> ::= `l' <trail> | `l' 15

<trail> ::= `d' <trail> | `l' <trail> | `d' 16 | `l' 17