My answer "they can draw and paint" was rejected, Duo suggested: "They can paint and draw." And again rejected, even though I typed literally "They can draw and paint." It only accepts the sentences with paint and draw swapped.
Yes, it seems to be an error. They can draw and paint should be the right answer.
Clearly a mistake by the duolingo team ;)
Piirtää I love that verb said van Gogh.