某22肽被水解成1个4肽，2个3肽，2个6肽，则这些短肽的肽键总数是

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21855' and id < 1909964 and id<>'1909964' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21855' and id > 1909964 and id<>'1909964' order by id asc limit 5