Binate

is a technical term from Boolean optimization that identifies expressions in which a variable appears both negated and non-negated, for example, A AND NOT A.

Here it is expanded to refer to a Form in which a variable occurs at both an odd and an even depth of nesting within Square-Brackets.

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Bricken, Iconic Arithmetic Volume III: The Structure of Imaginary And Infinite Forms, p. 373N6.