Using array elements as subroutine args

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#!/usr/bin/perl -w

...
    
    print "My number is $string\n";
}

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Found = in conditional, should be == at ./testsub.pl line 22.
Found = in conditional, should be == at ./testsub.pl line 19.
...
My number is one
My number is one
My number is one

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Use of uninitialized value in numeric eq (==) at ./testsub.pl line 16.
Use of uninitialized value in numeric eq (==) at ./testsub.pl line 16.
...
Use of uninitialized value in numeric eq (==) at ./testsub.pl line 16.
Use of uninitialized value in numeric eq (==) at ./testsub.pl line 16.
My number is four

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