1      x    x    x     x      x    x  -
2 0    x   x--x x-x  x---x   x--x x-x -
3 0 x x-x x-x x x x x-x x-x x-x x x x -

0 = chain
x = single crochet
x-x, x--x, or x---x = single crochet twice in same stich
- = slip stich