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Annotation of 42BSD/usr.lib/learn/eqn/L3.1d, revision 1.1

1.1     ! root        1: #once #create message
        !             2: .ND
        !             3: .PP
        !             4: There is one special construction with subscripts
        !             5: and superscripts that you have to be aware of, although
        !             6: it almost always does what you want automatically.
        !             7: When something has both a subscript and a superscript,
        !             8: it is usually printed as
        !             9: .EQ
        !            10: x sub i sup j
        !            11: .EN
        !            12: instead of
        !            13: .EQ
        !            14: {x sub i} sup j
        !            15: .EN
        !            16: To produce this effect, with the superscript _____above the
        !            17: subscript instead of to the right, you have to type
        !            18: the subscript ______before the superscript, like this:
        !            19: 
        !            20:    .EQ
        !            21:    x sub i sup j
        !            22:    .EN
        !            23: 
        !            24: That's all there is to it.
        !            25: 
        !            26: Modify "Example" to produce the following output, then type "ready".
        !            27: .pl 1
        !            28: #once #create Ref
        !            29: .LP
        !            30: .EQ
        !            31: x sub ij sup kmn = y sub i sub j
        !            32: .EN
        !            33: .pl 1
        !            34: #once #create Example
        !            35: .LP
        !            36: .EQ
        !            37: xxx
        !            38: .EN
        !            39: .pl 1
        !            40: #
        !            41: #once neqn Ref | nroff >X1 &
        !            42: #once neqn message Ref | nroff -T$term %s/tinyms -
        !            43: #user
        !            44: neqn Example | nroff >X2
        !            45: #cmp X1 X2
        !            46: #log
        !            47: #next
        !            48: 3.1e 10
        !            49: 3.2d 5

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