An image forming apparatus includes {TAIL ~ a first development unit}, a second development unit, and {HEAD ~ a control unit} 
An image forming apparatus includes { TAIL ~ a first development unit } , a second development unit , and { HEAD ~ a control unit }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD