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Program ::= Statement+
Statement ::= (AssignmentStatement | FunctionCallStatement) SEMICOLON
AssignmentStatement ::= "let" IDENTIFIER EQUALS Expression
FunctionCallStatement ::= IDENTIFIER LPAREN FunctionArguments? RPAREN
FunctionArguments ::= Expression ("," Expression)*
Expression ::= AdditiveExpression | FunctionDefinition
AdditiveExpression ::= PrimaryExpression ("+" AdditiveExpression)
PrimaryExpression ::= NUMBER | IDENTIFIER | FunctionCallStatement
FunctionDefinition ::= LPAREN FunctionParamters? RPAREN ARROW LBRACE Statement* ReturnStatement RBRACE
FunctionParameters ::= IDENTIFIER ("," IDENTIFIER)*
ReturnStatement ::= RETURN Expression SEMICOLON --TODO: I dont like this
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