A clustering algorithm applied to the part$-$machine incidence matrix resulted in the organization proposed below. If you were to increase the capacity of your system by adding new instances of any two machines, which machines would they be$,$ and why?

$\backslash$table$[[,$MACHINE,$],[,,$M$1,$M$4,$M$5,$M$2,$M$8,$M$3,$M$6,$M$7],[\backslash$table$[[!.]],$P$2,1,1,1,1,,,,],[$P$4,1,1,,,1,,,],[$P$1,1,,1,,1,,,],[$P$5,,,1,,,1,,],[$P$6,,,,,1,1,1,],[$P$3,,,,,1,,1,1]]$