Pattern needs more space between ribbing and thumb.

36 sts in k2p2, for 25 rnds. inc 12 sts next rnd, knit 1 rnd even, start thrums (every 4 sts, every 5 rnds, stagger eor). Make thumb 12 rnds past ribbing.

Note: 6 rnds for 1st thrum repeat, not 5.

do 3 st dec in 1st, 3rd and 4th decrease position (not evenly spread). Initial decrease round 2 rnds after 11th thrum round