Desired effect Example:
IN: Array of Arrays:
(0=>(a,b,e,d), 1=>(a,b,c,f), 2=>(d,h,f), 3=>(d,i,g))
OUT: Hash:
$out{a}{b}{e} = d
$out{a}{b}{c} = f
$out{d}{h} = f
$out{d}{i} = g