
fill ~ ~ ~ ~ ~ ~ wheat[age=7] replace wheat[age=6]
fill ~ ~ ~ ~ ~ ~ wheat[age=6] replace wheat[age=5]
fill ~ ~ ~ ~ ~ ~ wheat[age=5] replace wheat[age=4]
fill ~ ~ ~ ~ ~ ~ wheat[age=4] replace wheat[age=3]
fill ~ ~ ~ ~ ~ ~ wheat[age=3] replace wheat[age=2]
fill ~ ~ ~ ~ ~ ~ wheat[age=2] replace wheat[age=1]
fill ~ ~ ~ ~ ~ ~ wheat[age=1] replace wheat[age=0]
