R f 4

R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4R f 4