c# - Concatenate 3 lists of words -

i trying figure out how create single concatenated list using c#, originating 3 separate lists. example:

 list 1: ugly, pretty  list 2: dogs, carts, pigs  list 3: rock, suck 

output:

 ugly dogs rock  ugly dogs suck  ugly cats rock  ugly cats suck  ugly pigs rock  ugly pigs suck  pretty dogs rock  pretty dogs suck  pretty cats rock  pretty cats suck  pretty pigs rock  pretty pigs suck 

i know nested loops, part cant figure out how use list-strings each list.

var list = s1 in list1            s2 in list2            s3 in list3            select s1 + " " + s2 + " " + s3;