3 dc 1 tr Turn.
Round 2(Repeat Row 1, counts as Row 1 of repeat) Ch 4 (counts as tr), turn. In first stitch, 2 dc .fpdc in each stitch until you reach the ch-2 center space. In ch-2 space: 2 dc, ch 2, 2 dc. fpdc in each stitch until last stitch. In top of turning ch-4: 2 dc, 1 tr.
Round 3Ch 4 , turn. In first stitch, 2 dc . dc in each stitch to ch-2 space. In ch-2 space: 2 dc, ch 2 , 2 dc.dc in each stitch until last stitch. In top of turning ch-4: 2 dc, 1 tr.
Round 4Ch 4 , turn. In first stitch, 2 dc . [Chain 1, skip 2, shell in next stitch]: Shell = dc, ch 1, dc, ch 1, dc in same stitchRepeat: ch 1, skip 2, dc in next, then ch 1, skip 2, shell in next. Continue this alternating sequence until 2 stitches remain before the center point. DO NOT chain 1 after last shell before point. In ch-2 space: 2 dc, ch 2, 2 dc. Mirror the sequence on the other side: [skip 2, shell] ch 1, skip 2, dc ch 1, skip 2, shell. Continue as established. Last stitch: In turning ch-4, 2 dc, 1 tr.
Round 5Ch 4 , turn. In first stitch, 2 dc . Skip 1 st ; shell in next. Do not ch 1 after this shell.Repeat: ch 1, dc in middle dc of shell; ch 1, shell in next single dc. Continue until last shell before center point. ch 1, skip 1, shell in next (last shell before center). DON'T ch 1 after last shell. In ch-2 space: 2 dc, ch 2, 2 dc. Mirror sequence on other side as established. Last stitch: In turning ch-4, 2 dc, 1 tr.
Round 6Ch 4 , turn. In first stitch, 2 dc . Double crochet, ch 1, double crochet in next stitch ( half shell ).Repeat: ch 1, dc in middle dc of shell; ch 1, shell in next single dc. Continue to last half shell before center point. ch 1, skip 2, half shell in last st before center. Don't ch 1 after last half shell. In ch-2 space: 2 dc, ch 2, 2 dc. Mirror sequence on other side as established. Last stitch: In turning ch-4, 2 dc, 1 tr.
Round 7Ch 4 , turn. In first stitch, 2 dc . dc into each dc and chain-1 space EXCEPT chain-1 spaces within shells/half shells.Skip chain-1 spaces of shell/half shell, only dc in chain-1 spaces between, and in dc stitches themselves. In ch-2 space: 2 dc, ch 2, 2 dc. Mirror sequence on other side. Last stitch: In turning ch-4, 2 dc, 1 tr.Rows 2–7 form your repeat. Repeat Rows 2–7 until shawl reaches desired size. (Sample shown with 39 rows; end after a Row 2 and Row 3 for a neat finish.)Row 7 clarification: Only put dc in chain-1 spaces that are between shells, not within shells. Always check your stitch count at each row point; both sides should mirror. Read each row carefully, especially for where you skip chain spaces. Single repeat may seem complex, but it becomes intuitive quickly. Use stitch markers if it helps mark center or repeats.