This is a "word ladder" to drill your knowledge of San Francisco street names. By "word ladder", I mean that if a letter appears more than once in a line and in adjacent lines, typing that letter in one blank will make your appear in appropriate blanks in the line and adjacent lines.
To see what I mean: the second street name is LOVERS LN. Fill in the blanks and see what happens.
This isn't all SF street names; there are thousands. These are names of long streets, streets that share their names with planets or presidents or California counties or Morse code-related thingies. Plus that NORTHWOOD, EASTWOOD, SOUTHWOOD, WESTWOOD quartet. Look, I was just trying to prep for Chris Arvin's Name SF Streets game and came up with some things I thought I could memorize.