hmm not sure if I'm understanding the backtracking rule, if I'm going through the route below, does the route from BKK back down to DPS and DPS back up to TPE count as backtracking?
YYZ - CAI
CAI - IST
IST - MLE - stop
MLE - SIN
SIN - SGN
SGN - BKK - stop
BKK - DPS - destination
DPS - TPE
TPE - YYZ
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