this problem (0d87d2a6) is ambiguous

- should a block touched by a line, but not pierced by it, turn blue?
- should points that lay along an edge be connected?

the examples don't specify this so o3 (high) is forced to guess, and guesses wrong in both attempts https://t.co/kNrVydMqqd https://t.co/bApjbtlN0x