REM-NODE : MTREEOPREM-NODE is a matingstree command.
Remove the last connection. The subsumption is considered.
If the node is the root, the whole matingstree is removed. The
usage of the command is exactly the as the usage of REM-LAST-CONN.
Please check the help message for REM-LAST-CONN if necessary.
The command format for REM-NODE is:
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