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$hsh{k1}{k2}{k3}{k4}=v1;
$hsh{k1}{k9}{k3}{k33}=v2;
....

if ( $hsh{ch1}{ch2}{ch3} ) {  ...something... }

if ( $hsh{ch1} && $hsh{ch1}{ch2} && $hsh{ch1}{ch2}{ch3} ) 
{...}

  DB<4> $h{a}{b}=[1,2]; $h{a}{c}=[3,4]  #hash with two elements (array
+s) and in 2 levels

...
        };

  DB<9> delete $h{p}