It's polite to begin a letter with a greeting, but this practice is less common in email.
We built a homestead at the convergence of two rivers
The compositional inverse of a function f is f⁻¹, as ff⁻¹= mathit I, as mathit I is the identity function. That is, ∀x,f(f⁻¹(x))= mathit I(x)=x.
Blondies are brownies of a different color with a butterscotchlike flavor.
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DiQt（ディクト）
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