The following pseudocode is executing using the "Shopping bills" dataset. There are n customers in the dataset and every customer is assigned an index from 0 to n-1. Let custShops be a dictionary with index as key mapped to the list of shops visited by the customer.
For r != c, what does the value M[r][c] represent at the end of the execution?
```
M = createMatrix(n, n)
foreach r in keys(custShops){
foreach c in keys(custShops){
if(r != c){
M[r][c] = doSomething(custShops[r], custShops[c])
}
}
}
Procedure doSomething(L1, L2)
t = []
Flag = True
foreach i in L1{
foreach j in L2{
if(i == j){
Flag = False
exitloop
}
}
if(Flag){
t = t ++ [i]
}
Flag = True
}
return(t)
End doSomething
```
