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Vigor's partner (3 letter answer)
The answer VIM is common and appears about once every 200 puzzles.
VIM as a noun:
1. (energy, vim, vitality) = a healthy capacity for vigorous activity; "jogging works off my excess energy"; "he seemed full of vim and vigor"
2. (energy, muscularity, vigor, vigour, vim) = an imaginative lively style (especially style of writing); "his writing conveys great energy"; "a remarkable muscularity of style"