(B)0[munique-clause =
qqqqqqwqqq>qqqqqwq> [4mUNIQUE[m qqq> rse qqq>
mqq> [4mNOT[m qj
The condition containing UNIQUE is true if the record stream
specified by the RSE includes only one record. If you add NOT,
the condition is true if there is more than one record in the
record stream or the record stream is empty.