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    Topic complex Array functions
    Function bitandnot()
    Short Intersection of a bit field with the complement of another
    Syntax BITANDNOT(VAR M1 : TBITS; VAR M2 : TBITS) : INTEGER
    Parameter M1 : TBITS[]
    M2 : TBITS[]
    Return NBITS(M1) after operation (= Cardinality of M1)
    See also:
    bitand() bitor() bitnot() bittrunc() bitsum()
    Description M1 and M2 are understood as characteristical funktions of two (sub-)sets.
    After execution of the function, M1 contains the characteristical function of the section of M1 with the complement of M2.

    Important: Both arrays should be dimensioned equally, because otherwise the result is valid only in the area of the smaller field.

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