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Hi, I am having a problem using STKO. I want to know how equalDOF command in condition selects entities. I can't select any entities after adding equalDOF command, but fix command can select nodes.

Dear chry,
to assign an equalDOF condition you need to select an interaction, not just a specific node or nodes. The equalDOF constructs a multi-point constraints between nodes, in order to do that you need to define an interaction between the nodes you want to constrain to some other which are retaining them.
Once you have an interaction you will be able to select it from the condition editor when creating the equalDOF condition.
Enjoy your modelling
Francesca

Thank you for your help. I'll try it. Thanks again!

You are welcome!