Cause and effect: because, as a result, therefore, consequently, if/then
Addition: and furthermore, in addition, as well
Contrast: but, however, instead, nevertheless, on the other hand, even thought, although, still
Similarity: also, similarly, likewise, just as
Time: then, now, later, next, meanwhile, previously, before, after, afterwards, already, eventually, immediately, often, since, usually, as soon as, when.
Sequence: first, second, next, then
Example: for example, as an example, for instance, to illustrate
Conclusions: in summary, in conclusion, in brief, for these reasons
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