Moses speaks a poetic song to the people of Israel. Moses continues to use parallelism to emphasize what he is saying. (See: [[rc://en/ta/man/jit/figs-parallelism]])
The words "perverted" and "crooked" mean basically the same thing. Moses uses them to emphasize how wicked the generation is. Alternate translation: "a completely wicked generation" (See: [[rc://en/ta/man/jit/figs-doublet]])