What: indicates what we wish to remove from the selection. Valid values are sim_handle_single (removes one object from the selection), sim_handle_all (removes all objects from the selection), sim_handle_tree (removes the tree with base objectHandle (inclusive) from the selection, sim_handle_chain (removes the chain with tip objectHandle (inclusive) from the selection.
objectHandle: handle of the object to remove from the selection. If sim_handle_all is specifies in "what", then objectHandle is ignored
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