Which issue of 3d crossword puzzle is a joke?

Issue 303. The joke series refers to the 303rd 3D crossword puzzle, which is composed of letters X, H and L, and forms a seemingly continuous smiley face pattern through arrangement and combination, suggesting the answer to the joke series. Joke is a Chinese vocabulary, which means something or something that makes people laugh. Jokes are short in length, simple and ingenious in plot, and often unexpected, giving people a wonderful feeling of being suddenly enlightened. Most of them reveal absurd phenomena in life, which are ironic and entertaining and have different tastes.