local function split(test, f, s, v)
	local bridge = v
	local function filter(...)
		bridge = ...
		if test(...) then
			return nil
		else
			return ...
		end
	end

	local function head(s, v)
		return filter(f(s, v))
	end
	return function() return head, s, v end, function() return f, s, bridge end
end