Quick code sketch for picking from six cards

pick_sketch.lua

    function shuffle(t)
        local n = #t
        while n > 2 do
            local k = math.random(n)
            t[n], t[k] = t[k], t[n]
            n = n - 1
        end
        return t
    end

local t =
{
    index =1,
    last_pick = -1,
    picks = {1,2,3,4,5,6},
    pick = function(self)

        if self.index > #self.picks then
             self.picks = shuffle(self.picks)
             self.index = 1
             if self.picks[self.index] == self.last_pick then
               self.picks[self.index], self.picks[#self.picks] = self.picks[#self.picks], self.picks[self.index]
             end
        end

        local pick = self.picks[self.index]
        self.last_pick = pick
        self.index = self.index + 1
        return pick
    end
}

math.randomseed(os.time())
math.random()
shuffle(t.picks)

for i = 1, 25 do
   print(t:pick())
end