I have three lists (each of the entry is a string of letter:number-number) like so:

List1

a:10-34 b:9-12 c:12-24 e: 1-9

List 2

a:1-8 a: 19-24 b:2-6

List3

a:7-11 d:9-23 e: 12-23

The final answer should look like so:

a:1-34 b:2-6 b:9-12 c:12-24 d:9-23 e: 1-9 e: 12-23

Thank you Exalted Monks! Wishing you all a HNY 2014