|      1  |      1  | 
|      2 import M2._ |      2 import M2._ | 
|      3  |      3  | 
|      4  |      4  | 
|      5 assert(removeOne(List(1,2,3,2,1), 3) == List(1, 2, 2, 1)) |      5 assert(removeN(List(1,2,3,2,1), 3, 1)  == List(1, 2, 2, 1)) | 
|      6 assert(removeOne(List(1,2,3,2,1), 2) == List(1, 3, 2, 1)) |      6 assert(removeN(List(1,2,3,2,1), 2, 1)  == List(1, 3, 2, 1)) | 
|      7 assert(removeOne(List(1,2,3,2,1), 1) == List(2, 3, 2, 1)) |      7 assert(removeN(List(1,2,3,2,1), 1, 1)  == List(2, 3, 2, 1)) | 
|      8 assert(removeOne(List(1,2,3,2,1), 0) == List(1, 2, 3, 2, 1)) |      8 assert(removeN(List(1,2,3,2,1), 0, 2)  == List(1, 2, 3, 2, 1)) | 
|      9 assert(removeOne(List("a", "b", "b"), "b") == List("a", "b")) |      9 assert(removeN(List("a", "b", "b"), "b", 1) == List("a", "b")) | 
|         |     10 assert(removeN(List("b", "a", "b", "b"), "b", 2) == List("a", "b")) | 
|         |     11 assert(removeN(List("b", "a", "b"), "a", 2) == List("b", "b")) | 
|         |     12  | 
|         |     13 //assert(removeOne(List(1,2,3,2,1), 3) == List(1, 2, 2, 1)) | 
|         |     14 //assert(removeOne(List(1,2,3,2,1), 2) == List(1, 3, 2, 1)) | 
|         |     15 //assert(removeOne(List(1,2,3,2,1), 1) == List(2, 3, 2, 1)) | 
|         |     16 //assert(removeOne(List(1,2,3,2,1), 0) == List(1, 2, 3, 2, 1)) | 
|         |     17  |