Sentence:  Hence , when the address * * f is computed from * * f , the cell * * f and all Y-cells in its chain must be inspected to determine whether * * f is already in the <WSD>form</WSD> list or whether it should be added to the form list and the chain . 
Meaning of the word marked with <WSD> tags:  the phonological or orthographic sound or appearance of a word that can be used to describe or identify something