Circles = relay towers (T#). Lines = radio links. Each tower's battery dies after ONE relay — every tower may appear in at most one message's route. S#/D# = message source/destination. Click towers to extend the draft path for the selected message.
Relays complete — submit your result
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Human mode: pick a message, click towers to build its path, Commit. Greedy shortest-path routing always strands a message — the six routes must be planned jointly.