it's going to depend a lot on:
which block you choose;
how many strips in the roll are dark, and how many are light.
if you choose the second block (all random) i think you'd need at least two jelly rolls.
if you choose either of the other two my guess would be three rolls.
assuming you get 42 usable inches from each strip:
9 pieces per strip
2 strips per block
35 blocks
70 strips
__________________
- necessity is the mother of invention. lazy is the crazy aunt.
