Computercraft double box manager

os.loadAPI("sortapi");

local sorter = { peripheral.wrap("left"), peripheral.wrap("back") };
local chestdir = { sortapi.dir("west"), sortapi.dir("south") };
local outdir = { sortapi.dir("east"), sortapi.dir("north") };

local limit = 5;

print("Double Box Manager v1.0");
print("By TTFTCUTS");

while(true) do
    if ( redstone.getInput("right") ) then
        break;
    end

    for i=1,2 do

        local box = sorter[i].list( chestdir[i] );
        sleep(0.1);

        if box then

            for k,v in pairs(box) do
                if (v>limit) then
                    sorter[i].extract( chestdir[i], k, outdir[i], v-limit );
                end
                sleep(0.05);
            end

            sleep(0.1);
        end
    end

    sleep(5);
end