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    String found where operator expected at G:\x.pl line 15, near ""Y" "\n
+""
    (Missing operator before  "\n"?)
...
Global symbol "$AAGCTT" requires explicit package name at G:\x.pl line
+ 14.
syntax error at G:\x.pl line 15, near ""Y" "\n""
Execution of G:\x.pl aborted due to compilation errors.
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    my $substring = "AAGCTT";
read $fhCharacters, $data, length($substring);
if ( $data eq $substring) ) {