Hi,

I am solving an optimization problem with jump using the following table:

```
Row │ time room_1 room_2 room_3 w_day
│ Float64 Float64 Float64 Float64 String
─────┼─────────────────────────────────────────────
1 │ 10.0 2.0 1.0 5.0 Monday
2 │ 11.0 3.0 1.0 6.0 Monday
```

I need to create a binary variable x[time,room,w_day], my problem is that for time 10 I can only have courses 2, 1 and 5. that would get me x[10,2,Monday], x[10,1,Monday] and x[10,5,Monday].

Usually I make the variable, like:

```
@variable(model, x[10,[1,2,5],"Monday"], Bin)
```

But JuMP is interpreting the string as a list of strings and giving me the following:

```
x[10,1,M] binary
x[10,2,M] binary
x[10,5,M] binary
x[10,1,o] binary
x[10,2,o] binary
x[10,5,o] binary
x[10,1,n] binary
x[10,2,n] binary
x[10,5,n] binary
x[10,1,d] binary
x[10,2,d] binary
```

What am I doing wrong?

Thank you!