OpenBSD-4.6/usr.bin/learn/lib/eqn/L11.1e

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.LP
Sometimes there will be a need for a subscript or superscript
that has nothing to the left of it, as in references like
  $"" sup 1$Smith, J. `A great paper...'

Experiment and decide if you can get this effect
by writing simply
  %sup 1%Smith, J.....

Type yes if this works, no if it does not.
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11.1f 10