Crochet Techniques: Increasing Stitches Using Double and Single Crochet

Understanding Stitch Increases
The quantity of stitches is multiplied by 3 + 2 chain stitches increase.
Row Instructions
1st Row
1st row: * 2 double crochets in the 4th chain stitch, skip 2 chain stitches, (1 single crochet, 2 double crochets) in the 3rd chain stitch, skip 2 chain stitches*; repeat from * to * to last 4 stitches, skip 2 chain stitches, 1 double crochet in the 3rd and 4th stitches;
2nd Row
2nd row: 2 chain stitches increase, skip the 1st single crochet, 2 double crochets in the 2nd single crochet, (1 single crochet, 2 double crochets) in the single crochet of the previous row; repeat from * to * to the last single crochet of the previous row. Finish the row: 1 double crochet in the 1st double crochet of the previous row, 1 double crochet in the chain stitch increase of the previous row.
Repeating Rows
Repeat 2nd row.