How Many Unique Styles?

There are many different styles of music and many albums exhibit multiple styles. Create a function that takes a list of musical styles from albums and returns how many styles are unique.

Examples

unique_styles([
  "Dub,Dancehall",
  "Industrial,Heavy Metal",
  "Techno,Dubstep",
  "Synth-pop,Euro-Disco",
  "Industrial,Techno,Minimal"
]) ➞ 9

unique_styles([
  "Soul",
  "House,Folk",
  "Trance,Downtempo,Big Beat,House",
  "Deep House",
  "Soul"
]) ➞ 7

Notes

N/A