Ways to arrange three of {a,b,c,d,e}

abc*	abd	abe	acb*	acd	ace
adb	adc	ade	aeb	aec	aed
bac*	bad	bae	bca*	bcd	bce
bda	bdc	bde	bea	bec	bed
cab*	cad	cae	cba*	cbd	cbe
cda	cdb	cde	cea	ceb	ced
dab	dac	dae	dba	dbc	dbe
dca	dcb	dce	dea	deb	dec
eab	eac	ead	eba	ebc	ebd
eca	ecb	ecd	eda	edb	edc

Ways to arrange {a,b,c}

abc	acb	bac	bca	cab	cba