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sub f{($s,$t)=@_;while($t->{d}ne$s){$t=$t->{(r,l)[$s lt$t->{d}]}||retu +rn}$t}
sub f{($^,*_)=@_;*_=$_{(r,l)[$^lt$_{d}]}||return while$_{d}ne$^;*_}
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