Editorial corrections for rq25 (sec 9.3)

Section "9.3 Duplicate Solutions" (DISTINCT and REDUCED) refers to 'solution 
sequence' as does the intro in sec 9.

e.g. sec 9:
[[
A solution sequence modifier is one of:
   ...
   *Distinct modifier: ensure solutions in the sequence are unique
]]


Sections "9.3.1 DISTINCT" and "9.3.2 REDUCED" refer to 'solution set' : that 
should be 'solution sequence'.

I think we should change 9.3.1 and 9.3.2 to use the right language, replacing 
'solution set' for 'solution sequence'

	Andy

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