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require 'formula'
require 'tab'
require 'set'
module Homebrew
def leaves
installed = Formula.installed
deps_of_installed = Set.new
installed.each do |f|
deps = []
tab = Tab.for_formula(f)
f.deps.each do |dep|
if dep.optional? || dep.recommended?
deps << dep.to_formula.name if tab.with?(dep)
else
deps << dep.to_formula.name
end
end
deps_of_installed.merge(deps)
end
installed.each do |f|
puts f.name unless deps_of_installed.include? f.name
end
end
end
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