You can't print before you've read the whole file, otherwise you don't know the counts. If this is really a problem (test it and see), you can store just line numbers in the hash instead of the full blocks, and then read the file for the second time and print the numbers (but only print the first block for each corresponding key!).
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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