wild guess

$MasterHash{$mvr} = { map { split /:/; } @array1 };

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In reply to Re: Adding an element of an array as a key for a Hash, and remaining elements as its value (would also be a hash) by Anonymous Monk
in thread Adding an element of an array as a key for a Hash, and remaining elements as its value (would also be a hash) by abhiram10

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