By adding calls to the move and turnleft primitives, this
program causes Karel to walk a square, returning to his starting point.
Note that in this version of Karel, the
'{' and '}' are used for comments, just like Pascal.
{ A simple karel program to walk in a square to the left }
BEGINNING-OF-PROGRAM
BEGINNING-OF-EXECUTION
move;
turnleft;
move;
turnleft;
move;
turnleft;
move;
turnleft;
turnoff
END-OF-EXECUTION
END-OF-PROGRAM
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