First tower supplies iron and circuits for mk 1 sorters and electric motors for mk 2 sorters. The mk 1 sorters are fed directly to the assemblers for the mk 2 sorters. The other tower supplies electromagnetic turbines for the mk 3 sorters. The mk 2 sorters are fed directly to the assemblers for the mk3 belts. The mk 3 belts go to the second tower for distribution.