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  1. or download this
    sub r{
local$_=$@=pop;y/2569/5296/;$@!~/[347]/&&$@==reverse
}
  2. or download this
    sub r{
y/2569/5296/for$@=pop;$@!~/[347]/&&$@==reverse
}
  3. or download this
    sub r{
y/2569/5296/for$@=pop;!/[347]/&&$@==reverse
...
sub r2{
y/2569/5296/for$@=pop;!(/[347]/|$@-reverse)
}
  4. or download this
    sub r{
y/2569/5296/for$@=pop;!/[347]/&$@==reverse
...
sub r{
y/2569/5296/for$@=pop;!y/347//&$@==reverse
}