irnbru:
The file has T6 T7 S7 R6 T8 T5 S5 T3 as a failed line, however in that line one could instead do T6 T7 S7 R6 T5 and be connected. So I believe the correct refutation of that line should be T6 T7 S7 T5 R6 R7 T8 T3.

richyfourtytwo:
I haven't found the intended solution yet, but unless I'm missing something T6 - T7 - S7 - T5 connects.