local obj = {n = 2}
function obj:add(x)
  return self.n + x
end
function obj:multi(a, b)
  return a + b, a * b
end
local a, b = obj:multi(2, 5)
print(obj:add(3), a, b)
local t = {x = 10}
local function get() return t end
print(get().x, ("%s-%d"):format("v", 4))