Hierarchical query - Stop at specific leaf nodes - How to in Oracle 9i ?

Question

Table H -- Master table to build Hierarchical tree
C -- Child
P -- Parent
Table RN -- Table defining Root Nodes
N -- Node
Table LN -- Table defining Leaf Nodes
N -- Node
The following Query can generate trees starting with the nodes specified in the Table:RN
SELECT LEVEL L, C, P, SYS_CONNECT_BY_PATH(C,'/') SCBP
FROM H
START WITH C IN ( SELECT N FROM RN )
CONNECT BY PRIOR C = P
How do I limit the tree to the nodes specified in the LN table ?
"CONNECT BY" does not support "IN" clause
i.e
CONNECT BY PRIOR C = P AND P NOT IN (SELECT N FROM LN)
Say we have 2 trees
1-2-3-4-5
A-B-C-D-E
RN : 2,B
LN : 5,D
Result:
2,3,4 (5 is excluded)
B,C (D is excluded)
Any help is appreciated...

Answer 1

What about:
select level l, c, p, sys_connect_by_path(c,'/') scbp
  from (select * from h
         where c not in (select n from ln))  -- filter via an inline view
start with c in ( select n from rn )
connect by prior c = p;