infix operators, type 2: &&


 && :
    description:
        ket1 && ket2
        return |yes> if both ket1 and ket2 are |yes>, |no> otherwise
        sometimes it is cleaner to use the and() function instead of &&

    examples:
        |yes> && |yes>
            |yes>

        |no> && |yes>
            |no>

        |yes> && |fish>
            |no>

    see also:
        and, or, || 

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