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switch($argon) {
my $case = 0; {$IMPUTEinfile="$ARGV[$i]";}
...
    help();
}
}

if    ($argon == 0) { $IMPUTEinfile = "$ARGV[$i]"; }
elsif ($argon == 1) { $outfilePRE   = "$ARGV[$i]"; }
else  { help(); }