User blog comment:Simply Beautiful Art/Fast Array Iteration Leaping/@comment-5529393-20170404001617/@comment-31663462-20170404200806

No no, you can have consecutive @'s, as indicated by the ?'s and the d's. However, the must eventually be followed by b, some number. And I'm sorry if it wasn't clear, but when working with the number b, you look to the slot directly to the left of it, in this case 1@0.