```ruby
each do |formula|
puts formula.each.with_object([]) { |v, obj|
if v.is_a? Symbol
obj[-2, 2] = "(#{obj[-2, 2].join(" #{v} ")})"
else
obj << v
end
}
end
```
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やんてね (yantene@fla.red)'s status on Sunday, 17-Feb-2019 21:44:41 JST やんてね