M143:   M143<-M10<-Q = P.P, A
M420:   M420<-M143<-M10<-Q = P.P.E, B
M407:   M407<-M143<-M10<-Q = P.P.PL, C
M10:    M10<-Q = P, D
M421:   M421<-M143<-M10<-Q = P.P.E, B
M406:   M406<-M143<-M10<-Q = P.P.PL, C