*/3 15 1-10 3,4,5 */2: OK
* * * * 1-4,5-7,11,20: Field value (20) out of range (1-7)
* * * 1-4,5-7,11,20 *: Field value (20) out of range (1-12)
* * 1-4,5-7,11,20 * *: OK
* 1-4,5-7,11,20 * * *: OK
1-4,5-7,11,20 * * * *: OK