SHAPE ARMHOLES

Cast off 7( 7: 7: 8: 8: 8: 9: 9: 9: 10) sts at beg of next 2 rows, keeping pattern correct. [83 ( 89: 95: 99: 105: 111: 115: 121: 127: 131) sts] Next row K1, skpo, patt to last 3 sts, k2tog, K1. Next row Patt to end. Rep the last 2 rows 5 ( 6: 7: 7: 8: 9: 9: 10: 11: 11) times more. [71 ( 75: 79: 83: 87: 91: 95: 99: 103: 107) sts] ** Work straight until armhole measures 18