$ tree -f -a coy
coy
|-- coy/abu
|   `-- coy/abu/list.dat
|-- coy/baby
|   `-- coy/baby/list.dat
`-- coy/dabie
    `-- coy/dabie/list.dat

3 directories, 3 files

$ perl fffindrule.pl
["coy/abu/list.dat", "coy/dabie/list.dat"]