3D crochet stitch No 12

Pattern - for this project start with chain as is the project you want to create.
1 row - 3 chain ,skip 3 ch and the 4 chain 3dc in st(3 double crochet in the shame stitch),*skip3 chain 3ch 3dc in the st ( 3 chain, 3 double crochet in the same stitch)* repeat this and the end of row 
2 row -  3 chain , the next (3dc in st), *in the first dc working vertically 3post back dc(double crochet) , 3 chain *..repeats itself until the end of the series.