Case 1:
{ "01"  "10"  "10" }  
1

Answer 1:
2

Case 2:
 { "aaa"  "a"  "aa" } 
 
Answer 2:
"aaaaaa"

Case 3:
 { 2  1  3  5 }  
 { 2  1  3  5 }  
 { 4  5  3  2 }  
 { "NNNN"  "NNNN"  "NNNN"  "NNNN" }  
1000

Answer 3:
13000

Case 4:
2 
2

Answer 4:
6

Case 5:
"?????????,9"

Answer 5:
"1,2,3,4,5,9"

Case 6:
8 
8 
 { 2  2  2  2 } 
 
Answer 6:
394476764