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Corrections of clerical or grammatical errors are usually allowed, insofar as it is evident that an error has occurred and what the correction should be.
Rule 139Art. 123(2)
However, correction of errors in the description, claims and drawings is a special form of amendment and is bound by Art. 123(2) (G 2/95, see also H‑VI, 2.2.1). These errors can be corrected as set out below.