HELP with pattern!

[janae1987]

I'm starting a ripple afghan - and ive done the ripple from another pattern once before but am having a hard time figuring out exactly what this pattern wants me to do.

The pattern reads:

Row 1: with black, ch 212, 2 dc in 4th ch from hook, *[dc in next 2 chs, (dc next 2 chs tog) 4 times, dc in next 2 chs], 5 dc in next ch;repeat from * 14 more times;repeat between [], 3 dc in lst ch, turn (209 dc).