function placeSafe(first,last)
while(turtle.getItemCount(first) < 2 && first < last) do
first = first + 1
end
if(turtle.getItemCount(first) < 2) then
return(false)
else
turtle.select(first)
turtle.place()
return(true)
end

end
while(1) do
turtle.select(16)
turtle.place()
--turtle.select(15)
while(turtle.compareTo(16) == true) do
placeSafe(12,15)
sleep(2)
end
turtle.select(1)
turtle.dig() turtle.forward() while(turtle.digUp() == true) do turtle.up() end while(turtle.down() == true) do end
end