dcbb – double crochet into the stitch behind and below next st (2 rounds below)
tr-2a-1b – tr in the front loop 2 sts ahead and 1 round below
tr-2b-1b – tr in the front loop 2 sts behind and 1 round below
tr-2b – treble in the FLO of the st directly 2 rounds below
fptr-2a-2b – treble around the st 2 sts ahead and 2 rounds below
fptr-2b-2b – treble around the st 2 sts ahead behind and 2 rounds below
Popcorn st-2b – 4 double crochet into the top loops of the stitch 2 rounds below, pull up the loop, remove hook from the loops of the 4th dc and insert it into the loops of the first dcs (front to back, as usual), grab the loop from 4th dc and pull through; close popcorn with a ch1 (closing with ch1 does not count as stitch)
fptr-1b-2b/tr-3a-2b-2tog – with 1st leg around the fptr 1 ahead and 2 rounds below and 2nd leg into the FLO of st 3 ahead and 2 rounds below
tr-3b-2b/fptr-1b-2b-2tog – with 1st leg into the FLO of st 3 behind and 2 rounds below and 2nd leg around the fptr 1 behind and 2 rounds below
dtr/tr-2tog – yo 3 times, insert hook into FLO of indicated st, yo and pull through, (yo and pull through 2 loops) 3 times, yo twice, insert hook into FLO of indicated st, yo and pull through, (yo and pull through 2 loops) twice, yo and pull through all 3 remaining loops
dtr-1ab-4b-2tog – yo 3 times, insert hook into FLO of st 1 behind and 4 rounds below, yo and pull through, (yo and pull through 2 loops) 3 times, yo 3 times, insert hook into FLO of st 1 ahead and 4 rounds below, yo and pull through, (yo and pull through 2 loops) 3 times, yo and pull through all 3 remaining loops