SMITH, Judge.
Both the examiner and the Board of Appeals denied claims to appellant on a method of extruding a composite steel billet. This appeal was taken as to all of the rejected claims but has been withdrawn except as to claims 6 and 7. In his brief appellant presented claim 6 as an "example" claim and rewrote it in the form of claim 1, upon which it was dependent, substituting the word "steel" of claim 6 for the word "metal" in claim 1, as follows:
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