function iff(z)
    if a[z] == 1 then
        turtle.select(1)
    elseif a[z] == 2 then
		turtle.select(2)
	elseif a[z] == 3 then
		turtle.select(3)
	elseif a[z] == 4 then
		turtle.select(4)
	elseif a[z] == 5 then
		turtle.select(5)
	elseif a[z] == 6 then
		turtle.select(6)
    end
end