Which method of separation?

You will write a function that chooses a method of separation from one clue about a mixture: one part is magnetic, one part sublimes, or two liquids mix and have a gap between their boiling points. The program then tries it on five mixtures.

The idea. A method uses a property that differs between the parts. Simple distillation needs boiling points more than $25\ \text{K}$ apart; closer than that, fractional distillation.

Your tasks.

1. If the clue is "magnetic", return "a magnet".
2. If the clue is "sublimes", return "sublimation".
3. If the clue is "liquids", return "simple distillation" when gap is more than $25\ \text{K}$, and "fractional distillation" otherwise.