w.writeToFile(Collection, 'xxx.cllctn')
w.writeToFile(DT, 'xxx.dt')
w.writeToFile(DPMF, 'xxx.dpmfs')
w.writeToFile(SPMF, 'xxx.spmfs')
w.writeToFile(SCPT, 'xxx.scpt')

t = w[SCPT, 'concept1GivenC2C3C4']