Easy Crochet Pattern with Step-by-Step Instructions

The quantity of stitches is a multiple of 18 + 17.
Set-Up Row
Set-up row: 1 sc in second ch from hook, 1 sc in each ch across row, turn;
Row Instructions
1st Row
Ch 4 (counts as dc, ch 2), skip the first 3 sc, 1 dc in the next sc, *ch 2, skip 2 sc, 1 dc in the next sc, repeat from * across, turn;
2nd Row
Ch 1, 1 sc in the first dc, 1 sc in the next space, ch 3, 1 sc in the next space, *[2 dc, 4 tr, 2 dc] in the next space (shell made), 1 sc in the next space, [ch 3, 1 sc in the next space] 4 times, repeat from * across, ending last repeat at **, ch 3, 1 sc in the next ch-2 space, 1 sc in the second ch of turn ch, turn;
3rd Row
Ch 1, 1 sc in the first sc, ch 3, 1 sc in the next ch-3 space, *ch 3, skip the next 2 dc, 1 sc in the next tr, ch 3, skip the next 2 tr, 1 sc in the next tr, repeat from * across, ending last rep at **, ch 3, 1 sc in the next ch-3 space, ch 3, 1 sc in the last sc, turn;
4th Row
Ch 1, 1 sc in the first dc, 1 sc in the next space, ch 3, 1 sc in the next space, *[2 dc, 4 tr, 2 dc] in the next space (shell made), 1 sc in the next space, [ch 3, 1 sc in the next space] 4 times, repeat from * across, ending last rep at **, ch 3, 1 sc in the next ch-2 space, 1 sc in the second ch of turn ch, turn;
Repeat 3rd-4th rows.