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Simple variable assigment
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x := 10;
y := 20;
say x;
say y;

x = 30;
say x;
say y;

x = y;
say x;
say y;

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Array updates
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array := flat 1 2 3;
say array;

array = update array 1 10;
say array;

array = update array 1 (array.2);
say array;