	

    local menu_options = { --This is our menu table. It contains basic data about the menu
      [1] = {text="NinOS", color=colors.blue},
      [2] = {text="OneOS", color=colors.lime},
      [3] = {text="Linear", color=colors.gray}
    }
    local termX, termY = term.getSize() --The x/y size of the terminal
    local function menuDraw(selected) --Our main draw function
      local yPos = termY/2 - #menu_options/2 --The initial y position
      for index, data in pairs(menu_options) do
        menu_options[index].bounds = { --Create a new table in each option with the boundary data
          x1 = termX/2 - (#data.text+4)/2;
          x2 = termX/2 + (#data.text+4)/2;
          y = yPos;
        }
        term.setTextColor(data.color)
        term.setCursorPos(data.bounds.x1, data.bounds.y)
     
        local text =
          index==selected and "[ "..data.text.." ]" or
          "  "..data.text.."  " --Essentially an if statement, but in a contracted form
        term.write(text)
        yPos = yPos+1 --Increment the initial y pos so we can move on the next line
      end
    end
     
    local function checkClick(x,y) --Check the mouse click to see if there's a menu option
      for index, data in pairs(menu_options) do
        if x>= data.bounds.x1 and x<= data.bounds.x2 and y==data.bounds.y then
          return index --Returns the index of the clicked option
        end
      end
      return false --If it went through the entire for loop without success, return false
    end
     
    term.setBackgroundColor(colors.white)
    term.clear()
     
    local selector = 1 --Our selector
    while true do --The main loop. I would generally put this inside of a function for a program.
      menuDraw(selector) --Draw the menu first
      local e = {os.pullEvent()} --Pull an event and put the returned values into a table
      if e[1] == "key" then --If it's a key...
        if e[2] == keys.down then -- ... and it's the down arrow
          selector = selector < #menu_options and selector+1 or 1 --Increment the selector if the selector < #menu_options. Otherwise reset it to 1
        elseif e[2] == keys.up then
          selector = selector > 1 and selector-1 or #menu_options --Decrement the selector if the selector > 1. Otherwise, reset it to #menu_options
        elseif e[2] == keys.enter then
          break --Break out of the loop
        end
      elseif e[1] == "mouse_click" then
        local value = checkClick(e[3], e[4]) --Check the mouse click
        if value then --If checkClick returns a value and not false
          selector = value --Set the selector to that value and break out of the loop
          break
        end
      end
    end
     
     
if selector == 1 then
    shell.run("pastebin", "run eX4fBh8J")
elseif selector == 2 then
    shell.run("pastebin", "run 1RJAXN4g")
elseif selector == 3 then
    shell.run("pastebin", "run V2d8Xs06")
end




