Expresses cumulative progression, equivalent to 'not to mention... but also / not only... but furthermore...', where the first clause is already significant and the second intensifies it.
Indicates a sole prerequisite ('unless... otherwise...'), meaning that unless this specific condition is met, an undesirable result will ensue.
Functions as a resultative complement meaning 'to the very end / all the way through', indicating carrying an action through to final completion without giving up halfway.
Used to introduce precautionary measures to prevent unexpected accidents or errors ('to be on the safe side / just to be safe').
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