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for('00'..'99'){$h{$_}++if(!($h{$_}||$h{reverse$_}))}print keys%h

for('00'..'99'){if(!(exists$h{$_}||exists$h{reverse$_})){$h{$_}++}prin
+t keys%h

for('00'..'99'){$h{$_}++if(!(exists$h{$_}||exists$h{reverse$_}))print 
+keys%h