start      -> assign_var statement
assign_var -> DATATYPE VARIABLE ASSIGNMENT var assign_var | eps
var        -> expression | STRING
expression -> factore'
e'     -> PLUSMINUS factore' | eps
factor     -> gf'
f'     -> MULDIV gf' | eps
g      -> VARIABLE | NUMBER | DECIMAL
statement  -> STARTIF IF boolean_stmt THEN statement butif_stmt FINISHIF
statement  -> STARTFROM FROM assign_var UNTIL boolean_stmt LOOP statement FINISHFROM
statement  -> expression statement
statement  -> WRITE g
statement  -> READ g
statement  -> eps
butif_stmt -> BUTIF boolean_stmt THEN statement | eps
boolean_stmt -> expression bln_optr expression
bln_optr   -> EQUALITY | INEQUALITY | LESSTHANGREATERTHANEQUAL