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You can write sets like this S={1,2,3} This also means you can check for membership using {e}<S&S instead of e in S which saves one character.
S={1,2,3}
{e}<S&S
e in S
You can write sets like this S={1,2,3} This also means you can check for membership using {e}<S instead of e in S which saves one character
{e}<S
You can write sets like this S={1,2,3} This also means you can check for membership using {e}&S instead of e in S which saves one character.
{e}&S
