To show similarity or reinforce: also, and, as well as, by the same token, comparatively, correspondingly, coupled with, equally, equally important, furthermore, identically, in the light of, in the same fashion/way, likewise, moreover, not only... but also, not to mention, similarly, to say nothing of, together with, too, uniquely
To introduce an opposing point: besides, but, however, in contrast, neither, nevertheless, nor, on the contrary, on the other hand, still, yet
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To signal a restatement: in other words, in simpler terms, indeed, that is, to put it differently