The method
FoundationA four-sentence jumble has twenty-four possible orders and a five-sentence one has a hundred and twenty. Fixing a single mandatory pair removes most of them at once, which is why the pair is what you look for.
Find every sentence that cannot open, pair what is left, and check the options.
pairs first, sequence second
Read the sentences and arrange them by sense from the first to the last.
four sentences have twenty-four orders
Where it bites
Where no pair is obvious. Then look for the sentence that cannot be first, which eliminates options just as fast.