Just need to know the R code to generate this graphic, thanks!

Variable | Description ---------|------------ `year` | the year of the birth `month` | the month of the birth `state` | the state where the birth occurred, including "DC" for Washington D.C. `is_male` | which is `TRUE` if the child is male, `FALSE` otherwise `weight_pounds` | the child's birth weight in pounds `mother_age` | the age of the mother `child_race` | race of the child. `plurality` | the number of children born as a result of the pregnancy, with 1 representing a single birth, 2 representing twins, etc. `region` | the region of the US that the state is part of `state_color` | the political "color" of the state: red, blue, or purple

Create a graphic of mean weight of the child versus year, which includes separate lines for the two pluralities 1 and 2 (and does not include larger pluralities)