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Use of uninitialized value $sym8 in string eq at ./b.pl line 39, <DATA
+> line 4.
A exchangeB_groupA(ln4) not found
...
BFD exchangeC_groupA(ln7) not found
Use of uninitialized value $sym8 in string eq at ./b.pl line 39, <DATA
+> line 88.
ZZD exchangeB_groupA(ln4) not found