I have a table that list the mates to a part, but I notice that some of the bottom mates are below a horizontal line, indicting that they are somehow separated and different. Why is this happening?
One is a set that that part is mated into the assembly with (i.e. how it fits in itself) the others are mates to additional parts added afterwards.
Edit: For example, those three at the bottom hold the part in place in the assembly. If you remove any one of those all the other mates may give an error and potentially move around on you.
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