Where is the rhyme "Little Doubtful Buns" from?

Sourced from a Beijing children's song, it reads as follows: "The little beanbag in the first grade, one hit, one jump. The second grade's little water bowl, a poke an eye. The third grade is full of food, the fourth grade is loaded with bullets. When the fifth-graders open fire, the sixth-graders get out of the way.

Small Doubao is a Beijing nursery rhyme, Beijing nursery rhymes are nursery rhymes originated and circulated in Beijing city, Beijing's long history has produced a thick cultural precipitation, there were a large number of nursery rhymes, sung by children in the folklore, the syllables are harmonious, witty and humorous, and the accumulation of the excellent national culture, contains a rich educational content, has been selected as the second batch of national intangible cultural heritage directory in China.

Beijing nursery rhymes have ten forms of expression: thimbles, crosstalk, tongue-twisters, ballads and proverbs, lullabies, riddles, chain tunes, counting songs, question and answer songs, and proverbs, which are passed down through written documents and orally, and have a strong local flavor.