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Using 4mm needles, cast on 112 (124:132:144:152) sts.
Row 1 (RS): K3, (P2, K2) to last st, K1.
Row 2: K1, (P2, K2) to last 3 sts, P2, K1.
Rep these 2 rows until rib measures 6cm, ending after row 1.
Next row (WS): P7 (6:3:9:10), [M1P, P7 (8:7: 7:6)] 14 (14:18:18:22) times, M1P, P to end.
127 (139:151:163:175) sts.
Change to 5mm needles.
Row 1 (RS): (P2, K1tbl) 1 (3:5:7:9) times, P4, *TW2, P1, (K1tbl, P1) twice, TW2, P4, K1tbl, P2, K1tbl, P4, TW2, P3, TW2, P4; rep from * once more, **K1tbl, P2, K1tbl, P4, TW2, P1, (K1tbl, P1) twice, TW2, P4**; TW2, P3, TW2, P4, now work from ** to ** once more, (K1tbl, P2) 1