John VanSickle <evi### [at] hotmailcom> wrote:
> A manhole is *circular* minimize the amount of extra material needed to 
> make it impossible for the cover to fall into the manhole.

  Are you sure it's a question of minimizing material and not simply because
it's the *simplest* possible solution for the problem (ie. avoid the cover
to ever fall into the manhole)?

-- 
                                                          - Warp

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