( ( ( Divide ( the class ) ) ( into ( ( four teams ) ( of ( six ( or ( seven students ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Divide) (NP (DT the) (NN class)) (PP (IN into) (NP (NP (CD four) (NNS teams)) (PP (IN of) (NP (CD six) (CC or) (CD seven) (NNS students)))))) (. .)))
Divide the class into four teams of six or seven students.
(ROOT (S (NP (NNS Mollusks)) (VP (MD can) (VP (VB be) (VP (VBN divided) (PP (IN into) (NP (CD seven) (NNS classes)))))) (. .)))
Mollusks can be divided into seven classes.