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Annotation of 42BSD/usr.lib/learn/eqn/L5.1c, revision 1.1

1.1     ! root        1: #once #create message
        !             2: .ND
        !             3: .EQ
        !             4: delim $$
        !             5: .EN
        !             6: .LP
        !             7: Braces are an exceedingly useful construction.
        !             8: Wherever you have a place where you could have used
        !             9: a single thing like the letter "x", you can plug in
        !            10: anything in braces, and the whole thing will
        !            11: be positioned properly.  You can use braces with sub and sup
        !            12: and over, and all the other magic words we
        !            13: haven't seen yet.
        !            14: 
        !            15: First let's use braces with "over".
        !            16: Modify "Example" to produce this output, then
        !            17: type "ready".
        !            18: (Recall that $partial$ is called "partial".)
        !            19: .pl 1
        !            20: #once #create Ref
        !            21: .LP
        !            22: .EQ
        !            23: {partial y} over {partial x} ~=~ alpha over {alpha +1}
        !            24: .EN
        !            25: .pl 1
        !            26: #once #create Example
        !            27: .LP
        !            28: .EQ
        !            29: replace me
        !            30: .EN
        !            31: .pl 1
        !            32: #
        !            33: #once neqn Ref | nroff >X1 &
        !            34: #once neqn message Ref | nroff -T$term %s/tinyms -
        !            35: #user
        !            36: neqn Example | nroff >X2
        !            37: #cmp X1 X2
        !            38: #log
        !            39: #next
        !            40: 5.1d 10

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