Special Stitch - Spike Double Crochet in Crochet

Special Stitch
Sdc (Spike double crochet) = work dc over ch sp by inserting hook into top of next row below. When doing so, encase the ch st within the dc.
The quantity of sts is a multiple of 6 + 3 chain sts increase.
Work 1 row each in colors A, B, and C throughout.
Pattern Instructions
1st Row
Dc in 4th ch from hook; dc in each of the next 2 ch, *ch 3, sk 3 ch, dc into each of the next 3 ch; rep from * to end, turn;
2nd Row
*Ch 5, sk 3 sts, 1 Sdc over each of the next 3 sts; rep from * to last 3 sts, ch 3, sk 3 sts, sc into top of tch, turn;
3rd Row
Ch 3, 1 Sdc over each of the next 3 sts, *ch 3, sk 3 sts, 1 Sdc over each of the next 3 sts; rep from * to end, turn.
Repeat 2nd and 3rd rows.
Finishing
After completing the 2nd row: Ch 3, 1 Sdc over each of the next 3 sts *sc in each of the next 3 sts, 1 Sdc over each of the next 3 sts; rep from * to end of row.