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A bit pedantic I know, but example in regina 3.5 documentation for Insert() has strings in wrong order, e.g:
INSERT('first','SECOND',3) -> 'fiSECONDrst' is incorrect, should read
INSERT('first','SECOND',3) -> 'SEfirstCOND'
Not pedantic; just as major a bug as any other! Fixed in v3.8RC2