Square 9
Open Mesh
Make foundation chain in multiples of 3 plus 2 extra for the turn to make the required size.
1st row (1treble., 3 chain., 1 treble into the 5th chain from your hook, *miss 2 chain (1 treble, 3 chain, 1 treble into next chain., repeat from * ending with 1 treble into the last chain then 3 chain to turn.
2nd Row (1 treble, 3 chain, 1 treble into each of the 3 chain loops of the previous row ending with a treble in the top of the turning chain 3 chain to turn.
Repeat 2nd row for pattern till required length is achieved.