H 0 f

H 0 fH 0 fH 0 fH 0 f
H 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 f
H 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 f
H 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 f
H 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 fH 0 f