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Try:
sort -t "_" -k2 -k3 -g <filename>
-t "_" - field seperator is _
-t "_"
_
-k2 - 1st sort on the second column
-k2
-k3 - then sort on the third column
-k3
-g - general numerical sort
-g
sort -t "_" -k3 -g <filename>
-k3 - sort on the third column
