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#!/bin/sh
grep -Eo "(mul\\([0-9]+,[0-9]+\\)|do(n't)?\(\))" input \
| awk 'BEGIN { FPAT = "[0-9]+"; go = 1 }
/do\(/ { go = 1 }
/don/ { go = 0 }
/mul/ && go { x += $1 * $2 }
END { print x }
'
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