Lambdaclass Tap

How do I install these formulae?

brew install lambdaclass/tap/ethrex or brew install lambdaclass/tap/ethlambda

Or brew tap lambdaclass/tap and then brew install ethrex or brew install ethlambda.

Or, in a brew bundle Brewfile:

tap "lambdaclass/tap"
brew "ethrex"
brew "ethlambda"

Documentation

brew help, man brew or check Homebrew's documentation.