There are 6 towns {A, B, C, D, E, F} with the following one way street relation {(A, B), (A, C), (B, D), (C, B), (D, C), (D, F), (E, C), (E, F)}. Show all pairs of distinct towns that are reachable from one another in both directions.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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There are 6 towns {A, B, C, D, E, F} with the following one way street relation {(A,
B), (A, C), (B, D), (C, B), (D, C), (D, F), (E, C), (E, F)}. 

Show all pairs of distinct towns that are reachable from one another in both directions. 

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