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Old Friday, February 12, 2010
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qaarjk qaarjk is offline
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In my oppinion the logic is simple that it is easier to perform cleaning operation in a round one as compared to the other shapes. The angle or penetration in round shapes is more effective in clearing away the blockages.

Waisay agar koi cover rectangular ho ya triangular to us ka base bhi us se corresponding ho ga to beech main girnay wala problem un main bhi nahin ho ga in my oppinion
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