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Annotation of 42BSD/usr.lib/learn/eqn/L12.1e, revision 1.1

1.1     ! root        1: #once #create message
        !             2: .ND
        !             3: .tr %$
        !             4: .EQ
        !             5: delim $$
        !             6: .EN
        !             7: .PP
        !             8: There are also occasions when you want to omit
        !             9: the left part and keep the right part.
        !            10: This is a bit more complicated, since for obscure
        !            11: reasons neqn won't let you actually leave the
        !            12: left part out completely.
        !            13: But you can ask it to print no character,
        !            14: instead of using bars, by saying
        !            15:    left ""  thing  right |
        !            16: .LP
        !            17: This is similar to the way we used quotes before, to get
        !            18: a zero-width thing before a superscript.
        !            19: 
        !            20: For practice, modify file "Example" so it produces output
        !            21: that looks like this, then type "ready".
        !            22: .pl 1
        !            23: #once #create Ref
        !            24: .LP
        !            25: .EQ
        !            26: left ""
        !            27: int from 0 to {2 pi} sin (x) dx ~=~
        !            28: cos (x) right | sub 0 sup {2 pi}
        !            29: .EN
        !            30: .pl 1
        !            31: #once #create Example
        !            32: .LP
        !            33: .EQ
        !            34: replace me
        !            35: .EN
        !            36: .pl 1
        !            37: #
        !            38: #once neqn Ref | nroff >X1 &
        !            39: #once neqn message Ref | nroff -T$term %s/tinyms -
        !            40: #user
        !            41: neqn Example | nroff >X2
        !            42: #cmp X1 X2
        !            43: #log

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