circle

turtle.refuel()
list = {7,13,17,19,21,23,25,27,27,29,29,29,31,31,31,31}
dec = {0,3,2,1,1,1,1,1,0,1,0,0,1,0,0,0,0}
x = table.getn(list)

for deep = 0,50 do

for i=1,x do
    turtle.digDown()
    for k=1,list[i]-1 do
        turtle.dig()
        turtle.forward()
        turtle.digDown()
    end
    turtle.turnLeft()
    turtle.turnLeft()
    for k=1,list[i]-1 do
        turtle.forward()
    end
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
    for k=1,dec[i+1] do
        turtle.dig()
        turtle.forward()
    end
    turtle.turnLeft()
    turtle.turnLeft()
end

for i=x-1,1,-1 do
    turtle.digDown()
    for k=1,list[i]-1 do
        turtle.dig()
        turtle.forward()
        turtle.digDown()
    end
    turtle.turnLeft()
    turtle.turnLeft()
    for k=1,list[i]-1 do
        turtle.forward()
    end
    turtle.turnLeft()
    turtle.turnLeft()

    for k=1,dec[i] do
        turtle.dig()
        turtle.forward()
    end
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.turnLeft()
end

turtle.turnLeft()

for i=0,(2*x)-1 do
    turtle.forward()
end

for a=1,deep do
    turtle.up()
end
for slot = 1,16 do
    turtle.select(slot)
    turtle.drop()
end
turtle.turnRight()

for a=0,deep+1 do
    turtle.down()
end
end