In this video we show how to inc each side following the pattern.

We crochet the first 3 rows according to pattern but repeat inc one more time by starting 4th row based on explanation for 3rd row again.
We start with less ch since it’s the increases we want to show this time.
1st row: Ch 20, work 1 sc in 15th ch from hook, skip 4 ch, 1 sc in next/last ch (there are now 2 ch- spaces), turn.
2nd row: Ch 14, work 1 sc in the mid ch of the 7 in first ch-space from prev row, ch 3, 1 sc in the same ch, ch 7, 1 sc in 3rd ch on the last ch-space on prev row, ch 3, 1 sc in the same ch, ch 7 and work 1 sc in 8th ch on last ch-space (there are now 3 ch-spaces), turn.
3rd row: Ch 14, 1 sc in mid ch on first large ch-space on prev row, ch 3, 1 sc in the same ch,
ch 7, 1 sc in next large ch-space on prev row, ch 3, 1 sc in the same ch, ch 7,
1 sc in 3rd ch on the last ch-space on prev row, ch 3, 1 sc in the same ch, ch 7 and work 1 sc in 8th ch on last ch-space (there are now 4 ch-spaces), turn.
4th row: Ch 14, 1 sc in mid ch on first large ch-space on prev row, ch 3, 1 sc in the same ch,
ch 7, 1 sc in next large ch-space, continue following explanation with ch 3, 1 sc in the same ch and so on, there should be 1 sc, 3 ch, 1 sc in the middle on all large ch-spaces on every row, and 7 ch between each. And you finish each row with:
ch 7, 1 sc in 3rd ch on the last ch-space on prev row, ch 3, 1 sc in the same ch, ch 7 and work 1 sc in 8th ch on last ch-space. You will get 1 more ch-space for each row. Turn.

To see a pattern with this technique, see: DROPS 111-25 or the picture to the left.