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* , , / 0 1 ( 2 ) '!This list of all twoletter combinations includes 1352 (2 × 26 2) of the possible 2704 (52 2) combinations of upper and lower case from the modern core Latin alphabetA twoletter combination in bold means that the link links straight to a Wikipedia article (not a disambiguation page) As specified at WikipediaDisambiguation#Combining_terms_on_disambiguation_pages,A r (Ar) is the relative atomic mass of argon and M u = 10 −3 kg⋅mol −1 as defined at the time However, following the 19 redefinition of the SI base units, R now has an exact value defined in terms of other exactly defined physical constants History Navy Mil rV"t[[ gC v[h r Jbg