1. The mystery
2. The book published by P
3. The fiction novel
4. The romance novel
The mystery
1. BFD
2. BEA
3. AEF
4. ACD
BEA
1. ADF
2. BCE
3. AEF
4. BDF
BCE
1. ACE
2. CFE
3. BCF
4. ADE
BCF
1. DAE
2. CBA
3. DCB
4. CEB
CEB
1. CDB
2. EBF
3. BDE
4. ABF
BDE
1. ECA
2. EBF
3. ABD
4. ACD
ACD
1. CDE
2. BCD
3. CEF
4. ABC
CDE
1. BCE
2. ADF
3. BDE
4. ABE
ADF
1. BDE
2. BDF
3. ADE
4. DEF
BDF