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sub moveto {
  my ($p, @ch) = @_;
...
     $c.siblings = (listsubtract(\@ch, [$c]);
  }
}

foreach $f ('foo', 'bar', 'baz', 'wibble', 'tlee') {
   $$f = $r->{$f};
}

sub H{$_=shift;while($_){$c=0;while(s/^2//){$c++;}s/^4//;$
v.=(' ','|','_',"\n",'\\','/')[$c]}$v}sub A{$_=shift;while
($_){$d=hex chop;for(1..4){$pl.=($d%2)?4:2;$d>>=1}}$pl}$H=
"16f6da116f6db14b4b0906c4f324";print H(A($H)) # -- jonadab