here is a chair & its orthographic projection(view ) of a chair :-
| a comfort chair |
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cross section view of chair:-
part 1. a refinement of your one-sentence problem statement:- "A system/process/mechanism to handle waste material generated during travel in public transportation & also simple and convenient unloading of that garbage at desired place." PART 2.needs of “in-built dustbin” :-       here we have definition of problem in 5 why's format:- 
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