--- Selects any item in inventory
--- Returns true if an item is selected, false otherwise
function trySelectItemAnyFirst()
    for i = 1, 16 do
        if turtle.select(i) then
            return true;
        end
    end
    return false;
end

--- Place any item below
--- Returns true if successfully places and item below
--- False otherwise
function tryPlaceAnyDown()
    local b = trySelectItemAnyFirst()
    if not b then
        return false
    end
    return turtle.placeDown()
end

os.loadAPI("move")
move.lineMotionDoWhile(3, tryPlaceAnyDown)