2*4*3*2=48种
ABCDE ABCED ABDCE ABDEC ABECD ABEDC
ACBDE ACBED ACDBE ACDEB ACEBD ACEDB
ADBCE ADBEC ADCBE ADCEB ADEBC ADECB
AEBCD AEBDC AECBD AECDB AEDBC AEDCB
CABDE CABED CADBE CADEB CAEBD CAEDB
CBADE CBAED CBDAE CBDEA CBEAD CBEDA
CDABE CDAEB CDBAE CDBEA CDEAB CDEBA
CEABD CEADB CEBAD CEBDA CEDAB CEDBA