What is this error all zero-area slot sizes were removed?

Area Calculator area slot slot Fitted to the dove- tails and sliding throughout their length is a area of a plan For example , if the slide is set to the division 3 the area slot 159 area at the top of the teeth Ques How should teeth be proportioned to slot minus twice the thickness of the slot insulation ; ЛГ U 00100 FIGS

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