( ( ( 20-23 ( The ( common feature ) ) ) ( of ( all ( of ( these designs ) ) ) ) ) ( ( is ( ( the ( small size ) ) ( of ( the microscope ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ 20-23) (DT The) (JJ common) (NN feature)) (PP (IN of) (NP (NP (DT all)) (PP (IN of) (NP (DT these) (NNS designs)))))) (VP (VBZ is) (NP (NP (DT the) (JJ small) (NN size)) (PP (IN of) (NP (DT the) (NN microscope))))) (. .)))
20-23 The common feature of all of these designs is the small size of the microscope.
(ROOT (S (NP (DT All) (NNS cells)) (VP (VBP have) (NP (NP (DT the) (JJ small) (NN size)) (PP (IN in) (NP (JJ common))))) (. .)))