The only data structure needed is a multi-line string :) 

#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11147618
use warnings;

local $_ = join '', <DATA>;
1 while s[^(?:.*\n)((?:.*\n){2}//\n)((?:.*\n)*)\K.*\n\1][]m;
print;

__DATA__
nick
AAAAAAAAAA
BBBBBBBBBB
//
george
EGRGERHTETEHTHR
VFRTTHTRRHTE
//
andreas
AAAAAAAAAA
BBBBBBBBBB
//
thomas
EWTRYTUYJTHT
CEWWEQRWT$G
//
peter
EGRGERHTETEHTHR
VFRTTHTRRHTE
//

[download]

Outputs: 

nick
AAAAAAAAAA
BBBBBBBBBB
//
george
EGRGERHTETEHTHR
VFRTTHTRRHTE
//
thomas
EWTRYTUYJTHT
CEWWEQRWT$G
//

[download]

In reply to Re: Make unique hash of arrays? by tybalt89
in thread Make unique hash of arrays? by Anonymous Monk

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