TECH (naive)

[And Rosta -850 <ucleaar@UCL.AC.UK>]

If
  se  gives  x2 x1 x3
  te  gives  x3 x2 x1
then is it the case that
  se te  gives  x2 x3 x1
  te se  gives  x3 x1 x2
and
  te se te  and  se te se  both give  x1 x3 x2
?

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And.