1.DBG> DELETE/KEY KP4
      %DEBUG-I-DELKEY, DEFAULT key KP4 has been deleted

      This command deletes the key definition for KP4 in the state
      last set by the SET KEY command (by default, this is the
      DEFAULT state).

    2.DBG> DELETE/KEY/STATE=(BLUE,RED) COMMA
      %DEBUG-I-DELKEY, BLUE key COMMA has been deleted
      %DEBUG-I-DELKEY, RED key COMMA has been deleted

      This command deletes the key definition for the COMMA key in
      the BLUE and RED states.