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my $x;  # one statement
$x = $y if {condition;}   # two statement

 my $x if ... 
presuming
 my $x = $y if {condition;}

sunorccws04 ~$ cat tpl ; ./tpl
#!/usr/bin/perl
...
0 is the x value
9 is the x value
0 is the x value

sunorccws04 ~$ cat tpl ; ./tpl
#!/usr/bin/perl
...
0 is the x value
 is the x value
0 is the x value