OT? Languages with letters that always take diacriticals

[Curtis Clark]

Are there any languages that use letters with diacriticals, but *never* 
use the base letter without diacriticals? A made-up example to explain 
what made me think of it: Let's say a language has "ö", to represent the 
same sound that it does in German, but not "o", because the language 
lacks the sound represented by that letter in common European languages 
(the alternative being to use "o" to represent the "ö" sound).

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Curtis Clark                  http://www.csupomona.edu/~jcclark/
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