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#!/usr/bin/perl ... print "$line: ", ($@ ? $@ : 'OK'), "\n"; }
*/3 15 1-10 3,4,5 */2: OK ... * * 1-4,5-7,11,20 * *: OK * 1-4,5-7,11,20 * * *: OK 1-4,5-7,11,20 * * * *: OK