-- remove duplicate serums

local chest = peripheral.wrap("back")

while true do

  local serumTable = {}

  for i=1, chest.getInventorySize() do

    local itemStack = chest.getStackInSlot(i)
    if itemStack then
      if serumTable[itemStack.name] ~= nil then -- there exists another serum of this type
        if itemStack.dmg < serumTable[itemStack.name] and chest.getStackInSlot(serumTable[itemStack.name]) then -- the one in the chest is higher quality
          if chest.getStackInSlot(serumTable[itemStack.name]).dmg  == 16 then
            chest.pushItem("up", serumTable[itemStack.name], 1)
          end
        else
          if chest.getStackInSlot(i).dmg  == 16 then
            chest.pushItem("up", i, 1)
          end
        end
      else -- serum hasn't been seen yet, so add to table
        serumTable[itemStack.name] = i
      end
    end

  end

  sleep(1)
end