since (nontemporal meaning), as indicated by, because, for ,in that ,as (noncomparison meaning)
may be inferred from, given that,seeing that, for the reason that ,in as much as, owing to
therefore,wherefore, accordingly, we may conclude, entails that, hence, thus ,consequently, we may infer,
it must be that, whence, so, it follows that, implies that, as a result
If an argument has no indicators at all, then good English style suggests that the topic sentence of the paragraph is the conclusion of the argument.