6	ferric	5	rifer
5	ricer	5	frier
5	firer	5	crier
4	rife	4	rice
4	reif	4	fire
4	fice	4	cire
3	rif	3	ref
3	rec	3	ire
3	ice	3	fir
3	fie	3	fer
3	err	3	erf
2	re	2	if
2	fi	2	fe
2	er	2	ef