Cast on 48, 2x2 for 12 rounds.
Pattern 10 rounds. Start thumb on rnd 11, Inc to 21 thumb sts, place 19 on holder.
Work in pattern until hand is long enough (64 rounds total, for this pair).
2x2 for 8 rounds, bind off.
Pick up thumb, plus 3, dec 2 sts on first round; knit 3 more rounds plain. 2x2 for 8 rounds, bind off.