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Annotation of 42BSD/usr.lib/learn/eqn/L2.1f, revision 1.1.1.1

1.1       root        1: #once #create message
                      2: .ND
                      3: .LP
                      4: One of the most common problems in using neqn is forgetting
                      5: to leave spaces or tildes around "magic" words like "pi"
                      6: or "int" or "sum".  The result is that the magic words
                      7: cease to be magic, and just look like ordinary strings
                      8: of letters.
                      9: 
                     10: In the file "Example", there are several such errors.
                     11: Find them, and fix them so the output looks
                     12: like this, then type "ready".
                     13: .pl 1
                     14: #once #create Ref
                     15: .LP
                     16: .EQ
                     17: sum ~=~ pi ~+~1
                     18: .EN
                     19: .EQ
                     20: a~=~ pi (x)
                     21: .EN
                     22: .EQ
                     23: alpha ~=~ beta ~+~ gamma ~+~ delta
                     24: .EN
                     25: .pl 1
                     26: #once #create Example
                     27: .LP
                     28: .EQ
                     29: sum=pi+1
                     30: .EN
                     31: .EQ
                     32: a=pi(x)
                     33: .EN
                     34: .EQ
                     35: alpha=beta+gamma+delta
                     36: .EN
                     37: .pl 1
                     38: #
                     39: #once neqn Ref | nroff >X1 &
                     40: #once neqn message Ref | nroff -T$term %s/tinyms -
                     41: #user
                     42: neqn Example | nroff >X2
                     43: #cmp X1 X2
                     44: #log
                     45: #next
                     46: 3.1a 10

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