I tried to look through a lot of similar questions but I have a specific query. I have two or more sets of strings (space separated values). I want to loop through

```
firstString="f1 f2 f3 f4"
secondString="s1 s2 s3 s4"

```

I want something like 

```
f1-s1
f2-s2
f3-s3
f4-s4

```

(in a single loop)

I must be able to take the positional value of the second and further arrays in a single loop.