rawdata/data/building/actions.csv
action,material,cost_time,cost_material,method
join,[wood,wood],0.4,.01,nail
join,[wood,wood],0.4,.02,screw
join,[wood,wood],0.4,.2,butt joint
join,[wood,wood],0.6,.1,dovetail joint
join,[wood,iron],0.4, 0.04, screwdriver
join,iron,0.5,0.1,weld
cut,wood,0.4,0.04,hand saw
cut,wood,0.1,0.1,mitre saw
cut,iron,0.3,0.2,hacksaw
cut,iron,0.1,0.04,drop saw