[Aurora]

Hi,

I have got this pattern for V-neck sweater. I am stuck with the pattern for shaping the armholes. The pattern reads as follows

Shape Raglan Armholes

Bind off 2 sts at beg of next 2 rows. {119[125,133,139,147,153]sts}
Next Row[RS] K1, k2tog, k to last 3 sts, sL1K, k1, psso, k1.

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Working all raglan armhole decrease as set by ast row, dec 1st at each end of 4th [4th, 4th, 2nd, 2nd, 2nd] and ever foll alt row until 43 [45, 47, 47, 53, 55] sts rem.
Work 1 row, ending with RS facing for next row.

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40 and 42in [102 and 107cm] sizes only:
Next Row[RS] K1, k2tog, k to last 3 sts, sL1K, k1, psso, k1.
[B]Next Row P1, p2tog tb1, p to last 3 sts, p2tog, p1. {[49, 51] sts}
All sizes:
Break yarn and leave rem 43 [45, 47, 47, 49, 51] sts on a holder.

I need help in understanding the lines that I have marked within the red lines. Please help.