How to identify the same sizes as are available through the web interface

When I list the sizes available, I get many more options than what the standard web interface shows (I’ve included the NYC1 sizes in this post). Through the web interface, I can determine that it appears the sizes prefixed with s-, g-, or c- are “current”. However, there are other sizes listed as well. Are these valid sizes? Is there a more in depth description of them? My initial thoughts were that they are old hardware configurations that wouldn’t be available, but they have “available” listed as true.

How do I reduce this to the latest available droplets without resorting to hard coding the various prefixes and searching that way?

            "32gb",
            "16gb",
            "2gb",
            "1gb",
            "4gb",
            "8gb",
            "512mb",
            "64gb",
            "48gb",
            "c-16",
            "s-1vcpu-3gb",
            "c-32",
            "c-2",
            "c-4",
            "c-8",
            "m-1vcpu-8gb",
            "m-16gb",
            "m-32gb",
            "m-64gb",
            "m-128gb",
            "m-224gb",
            "s-1vcpu-1gb",
            "s-1vcpu-2gb",
            "s-2vcpu-2gb",
            "s-3vcpu-1gb",
            "s-2vcpu-4gb",
            "s-4vcpu-8gb",
            "s-6vcpu-16gb",
            "s-8vcpu-32gb",
            "s-12vcpu-48gb",
            "s-16vcpu-64gb",
            "s-20vcpu-96gb",
            "s-24vcpu-128gb",
            "s-32vcpu-192gb",
            "g-2vcpu-8gb",
            "g-4vcpu-16gb",
            "g-8vcpu-32gb",
            "g-16vcpu-64gb",
            "g-32vcpu-128gb",
            "gd-2vcpu-8gb",
            "gd-4vcpu-16gb",
            "gd-8vcpu-32gb",
            "gd-16vcpu-64gb",
            "gd-32vcpu-128gb",
            "gd-40vcpu-160gb"