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  1. or download this
    my $Person1 = defined($1) ? $1 : '';
my $Person2 = defined($2) ? $2 : '';
  2. or download this
    if ($Line =~ m/^Pairing Start\s+(\w+)\s+(\w+)/) {
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    Use of uninitialized value within %PairsOf in concatenation (.) or str
+ing at ./test_removing_pair_unitialized_value_error.pl line 26, <DATA
+> line 14.
Use of uninitialized value within %PairsOf in concatenation (.) or str
+ing at ./test_removing_pair_unitialized_value_error.pl line 27, <DATA
+> line 14.
Use of uninitialized value within %PairsOf in concatenation (.) or str
+ing at ./test_removing_pair_unitialized_value_error.pl line 27, <DATA
+> line 14.
Use of uninitialized value within %PairsOf in concatenation (.) or str
+ing at ./test_removing_pair_unitialized_value_error.pl line 27, <DATA
+> line 14.
Use of uninitialized value within %PairsOf in concatenation (.) or str
+ing at ./test_removing_pair_unitialized_value_error.pl line 27, <DATA
+> line 14.