Step-by-Step Guide to Crocheting Connected Quad DC

Understanding the Quantity of Stitches
The quantity of stitches is multiple 4 + 1 chain stitch increase.
Row Instructions
First Row
1st row: With A, into the 3rd chain from hook work 1 single crochet (sc), and sc into each chain to the end. Fasten off yarn. Do not turn;
Second Row
2nd row: Join B to the beginning of the previous row.
Chain 1 to count as first sc, skip the first stitch, and sc into each stitch to the end. Fasten off yarn. Do not turn work;Third and Fourth Rows
3rd and 4th rows: Work as row 2;
Fifth Row
5th row: Join A to the beginning of the previous row. Chain 1 to count as first sc, skip the first stitch, insert the hook under the horizontal front loop of the next stitch, yarn over (yo) and draw through a loop, (insert the hook under the horizontal front loop of the stitch immediately below the stitch just worked into, yo and draw through a loop) 3 times, (yo and draw through the first 2 loops on the hook) 4 times - 1 connected quad double crochet (dc) has been worked, *sc into each of the next 3 stitches, 1 connected quad dc into the next stitch; repeat from * to the last 2 stitches, sc into each of the next 2 stitches. Fasten off yarn. Do not turn work;
Rows Six to Eight
6th-8th rows: Work as row 2;
Ninth Row
9th row: Join A to the beginning of the previous row, chain 1 to count as first sc, skip the first stitch, sc into each of the next 2 stitches, *1 connected quad dc into the next stitch, sc into each of the next 3 stitches; repeat from * to the last stitch, sc into the last stitch. Fasten off yarn. Do not turn.
Final Instructions
Repeat the 2nd-9th rows.