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  1. or download this
    #%main_hash -> $keyA -> index[0] -> {$keya => $vala}
#                    -> index[1] -> {$keyb => $valb}
...
#           -> $keyB -> index[0] -> {$keyd => $vald}
#                    -> index[1] -> {$keye => $vale}
#                    -> index[2] -> {$keyf => $valf}
  2. or download this
    #
# initializing variables, opening and reading files, etc
...
# some other things to do
#