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If (r,s) = (10,4) then (u,v) = (-9,-3) -> different distance
If (r,s) = (1,1) then (u,v) = (0,0) -> different distance
If (r,s) = (1/4, 3/4) then (u,v) = (3/4, 1/4) -> same distacnce

Insufficiet.

Using both st1 and st2:
If (r,s) = (1/2,1/2) then (u,v) = (1/2, 1/2) -> same distance
If (r,s) = (4,-3) then (u,v) = (-3,4) -> same distance
Insufficient.

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