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first second third fourth fifth ... As a rule you add the suffix 'th' to a cardinal to get an ordinal,but 1,2, and 3 are special and there are some spelling changes: fifth and twelfth , fiftieth,etc.
There are no letters in that sequence. The progression of numbers can beextended according to the rule shown by appending '26' as the fifth term.
18
What is a fifth of a mile??
fifth