lpn!; practice 4.1 - combine1

```prolog
?- combine1([a, b, c], [1, 2, 3], X).
X = [a, 1, b, 2, c, 3].

?- combine1([f, b, yip, yup], [glu, gla, gli, glo], Result).
Result = [f, glu, b, gla, yip, gli, yup, glo].
```