Sentence:  For Athabascan , with a greater range of stems , the first two of five corresponding columns were identical , 1 and 2 stems ; the three others had to be spread somewhat , and are headed respectively * * f ; * * f ; and * * f <WSD>stems</WSD> . 
Meaning of the word marked with <WSD> tags:  (linguistics) the form of a word after all affixes are removed