Crochet a granny square with me - Day 13 (Jacob’s Ladder Granny Square)

Day 13 of making different granny squares/crochet squares till we have enough for a cardigan! Today’s granny square is basically a square consisting of the Jacob’s Ladder stitch.
R1: ch25
R2: dc into 4th ch from hook, (5dc, ch10, sl st into standing V at 1st ch)x3, 6dc, ch1, turn work
R3: sc into every stitch, change colour, ch3, turn work
repeat R2-R3 6 more times to make R4 to R15.
pull ch10 loop from R4 through ch10 loop from R2,
pull ch10 loop from R6 through ch10 loop from R4,
pull ch10 loop from R8 through ch10 loop from R6,
pull ch10 loop from R10 through ch10 loop from R8,
pull ch10 loop from R12 through ch10 loop from R10,
pull ch10 loop from R14 through ch10 loop from R12
R16: dc into every stitch, ch1, turn work
R17: (5sc, 1sc capturing ch10 loop from R14)x3, 5sc, change colour, ch3, turn work
R18: dc into every st, ch1, turn work
R19, sc into every st
Optional: sc along the 4 sides with 3sc at each corner st to create a border