for my $i (0..$#store_get) {
    print "@{ $store_get[$i] }\n"
}
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This reads

for my index from first to last (index)<p>
    print each group of (30)
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The @{ . . . } notation says treat $store_get[$i] as an array reference, which the 'notation' dereferences.

You would find it helpful to read perldsc, perllol which go into detail about how to work with arrays of arrays.