# ./pf1 ./da
./da
./da/s4
./da/s3
./da/s3/sz
./da/s2
./da/s2/sy
./da/s2/sx
./da/s2/sx/sa
./da/s1

./da
./da/s4
./da/s3
./da/s3/sz
./da/s2
./da/s2/sy
./da/s2/sx
./da/s2/sx/sa
./da/s1