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Many í-verbs or verbs of the Fourth Conjugation are formed from i-stems: -

a. Some arise by confusion from other stems treated as i-stems: -

NOTE: Some of this form are of doubtful origin: as, órdior, begin, cf. órdó and exórdium. The formation is closely akin to that of verbs in -ió of the third conjugation (p. 102).

b. Some are formed with -ió from consonant stems: -

NOTE: Here probably belong the so-called desideratives in -urió (see § 263.4. N.).