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Right Stuff
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Very Long Legs
The Proto-Indo-European system of root vowel alternations. There existed the following variants or "grades" of ablaut: full (or "e") grade, full grade with ablaut (or "o"), lengthened grade, lengthened grade with ablaut, and zero grade. The results of this alternation can be seen in the following ModE related words (listed in the same order as the above grades): sit, sat, seat, soot, nest; and also in the English strong verb system.