Is that even possible?
Absolutely, that chapter should have taught you how. Here's some pseudo code
for each ELEMENT of ARRAY
    if ELEMENT found in OTHERARRAY then
       print ELEMENT
    else
       add ELEMENT to OTHERARRAY
       calculate raise
       ...
    endif
endfor
...

[download]
guess what, the part that checks for duplicates without hashes looks exactly like this first :)

In reply to Re: Saving array duplicates, not using a hash? by Anonymous Monk
in thread Saving array duplicates, not using a hash? by gctaylor1

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