A Big confusion is there.
F1 full backup
T1 Log Backup
D1 Differential Backup
T2 Log Backup
D2 Differential Backup
T3 Log Backup
F2 full backup
T4 Log Backup
D3 Differential Backup
T5 Log Backup
D4 Differential Backup
T6 Log Backup
Now If F2 is corrupt. To restore database, the sequence :
F1, D4, T6
or F1, D2, T3, T4, T5, T6
I don't think F1, D3, T5, T6 works