define rules of variant

hi

can any body explain me about day type variant.and let me know how to write variant rule for a day 4 hrs working if next day is holiday and it is Saturday.please explain me these variant which is in below

RULE NO. HOL.CLASS HOL CLASS NXT DAY DAY VARIANT

01 01 *X****** XXXXXXXXXX XXXXXXX B

01 02 XX.XXXXXXX XXXXXXXXXX ***X* B

01 03 X********* XXXXXXXXXX ****X A

05 01 X********* X******** ****XXX

25 01 XXXXXXXXX XXXXXXXXXX XXXXXX

Thanks&regards

Manoj Kumar