List of paths for a particular endpoint

Hi,

For writting a script, I need to find all the paths that a connected to an endpoint of a particular flop with slack values.

I have three flops( ff3 , ff31 , ff32) communicating  with ff4. I need to find the names of these 3 flops using script.

I tried: 

puts [get_object_name [get_property [ report_timing -to ff4/D -nworst 3 -collection] launching_points]]

This is only giving me only 1 launch point ff31/CK.

How to get the list of all the flops???