How to find sub-journey matches in Google Maps using asp.net? -

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as know using "get directions" put starting point , destination , google maps shows marked route. question if person x travels b on route a-a-b-b, , other person y travels b sub part of b,then how can match both traveling on same route. in other words there path same or in cases part of path same. important have in asp.net web application.

thank


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