Factory Planning 2: When Should Machines Be Down for Maintenance

Ignore machine_type_period_data from Chapter 3, and replace machine_type_data as follows:

data machine_type_data;
   input machine_type $ num_machines num_machines_needing_maintenance;
   datalines;
grinder 4 2
vdrill  2 2
hdrill  3 3
borer   1 1
planer  1 1
;