6a^2$$6a^2$$
1 + 2 x + x^2$$1 + 2 x + x^2$$
[[1], 2, 2, 3, 4]$$\{\{1\}, 2, 2, 3, 4\}$$
6a^21 + 2 x + x^2[[1], 2, 2, 3, 4]