Is there a command to combine multiple resolution codes in a single URL

[anubismedia]

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I'm trying to download a video at 768x432 resolution (not best) when I run the command
youtube-dl --list-formats url
the URL breaks the video into 4 parts assigning each part an ID; each part has a different code for the resolution I'm trying to download so when I run the command
youtube-dl -f (code) url
it downloads the first part but then returns the error "requested format not available" after that. I've done some searching but cant seem to find the command line to combine multiple resolution codes or even download a specific video ID's So my question is, is there a way to attach multiple resolution codes to a command line or is there a command line that I can run to download just one part of the video by its ID number?

[dstftw]

Have you even read FAQ?

[anubismedia]

Solved the problem; have to use a "/" between resolutions
youtube-dl -f code/code url