Equal keys in hash

[Andrej Kastrin]

Deal all,

if the key already exists in the hash, then its value is overwritten. 
So, if I have the following structure of the input file

A foo
A faa
A hoo
B foo
B aaa
C bbb

what is the procedure of choice to store all key-value pairs into the 
hash and print it out?

Thanks in advance for any suggestion.

Best, Andrej

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