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    #!/usr/bin/perl

...
$DIcas_text = undef;
@HR = qw(a b c);
$s = sprintf($DIcas_text, @HR);
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    Use of uninitialized value in sprintf at /tmp/u.pl line 10.
Use of uninitialized value $HR[1] in sprintf at /tmp/u.pl line 14.
Use of uninitialized value $DIcas_text in sprintf at /tmp/u.pl line 18
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