SINK
start
look_at_p_proc
You see a sink.
start->look_at_p_proc
use_p_proc
You wash your hands.
start->use_p_proc
pickup_p_proc
start->pickup_p_proc
use_obj_on_p_proc
You wash your
---
. It is a bit cleaner.
start->use_obj_on_p_proc
pickup_p_proc->use_p_proc