Danielle bites her nails a lot but almost never combs her hair. According to the Premack principle,

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The Premack Principle suggests that more probable behaviors (those performed more frequently or with greater likelihood) can reinforce less probable behaviors. Since Danielle bites her nails a lot (a more probable behavior) and almost never combs her hair (a less probable behavior), nail biting could be used as a reinforcer for hair combing.

Danielle Bites Her Nails a Lot but Almost Never Combs