i did all those checks myself but when i did it it says there is no wraped plate, no zero length element .it only showed a pair of improperly connected plates. i did all those using the check options in the tools menu. the one i sent you was one i remade but when i did analysis it shows a lot of errors which did not show up when i was checking for errors. i think it got corrupted when i sent it to you.i don't know what is wrong. the model gets changed when i save and analyse it.
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