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    Interface Substitution

    A latched function of the older version and the held command of the newer one that stands for it.

    interface Substitution {
        by: readonly Expression[];
        replaced: readonly [Expression, Expression];
    }
    Index
    by: readonly Expression[]

    The commands that say the same thing in the other scale's words. Usually one, but a held command is punched as a chain of round holes with paper bridges rather than as a slot, and a scan whose analysis reports those singly gives one symbol per punch.

    replaced: readonly [Expression, Expression]

    The command that turned the function on, and the one that cancelled it.