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[Bruce] Lincoln ... coins the term sitiogonic to mean 'explaining the origin of food'

[Y]our hands come then, th’appurtenance of welcome is faſhion and ceremonie; let mee comply with you in this garb, let me extent to the players, which I tell you muſt ſhowe fairely outwards, ſhould more appeare like entertainment than yours: […]

In some cases, tenses keep this tone contrast, in others these tones are neutralized by either assigning tones to non-toned verb stems or by deleting tones, making all types of verb stems look the same tonologically speaking.