Different 'Collation Strength' values give different sort results:
[Äbc, äbc, Àbc, àbc, Abc, abc, ABC] - Original Data
[Äbc, äbc, Àbc, àbc, Abc, abc, ABC] Primary
[Abc, abc, ABC, Àbc, àbc, Äbc, äbc] Secondary
[abc, Abc, ABC, àbc, Àbc, äbc, Äbc] Tertiary
Case kicks in only with Tertiary Collation Strength :
[cache, CACHE, Cache] - Original Data
[cache, CACHE, Cache] Primary
[cache, CACHE, Cache] Secondary
[cache, Cache, CACHE] Tertiary
Accents kick in with Secondary Collation Strength.
Compare with no accents present:
Collator sees them as the same : abc, ABC - Primary
Collator sees them as the same : abc, ABC - Secondary
Collator sees them as DIFFERENT: abc, ABC - Tertiary
Compare with accents present:
Collator sees them as the same : abc, ÀBC - Primary
Collator sees them as DIFFERENT: abc, ÀBC - Secondary
Collator sees them as DIFFERENT: abc, ÀBC - Tertiary