Informix - Getting all descendants of a parent

I have a table with two columns, Parent and Child. Need to get the list of all descendants associated with the parent records. Source Table: +----+-----------+ | Parent | Child | +----+-----------+ | a | b | | b | c | | c | d | | d | e | | e | f | | f | x | +----+-----------+ Expected Result: +----+-----------+ | Parent | Child | +----+-----------+ | a | b | // As b is the child of a, all the descendants of b | a | c | // are also descendants of a. | a | d | | a | e | | a | f | | a | x | | b | c | // As c is the child of b, all the descendants of c | b | d | // are also descendants of b. | b | e | | b | f | | b | x | | c | d | | c | e | | c | f | | c | x | | d | e | | d | f | | d | x | | e | f | | e | x | | f | x | +----+-----------+ Informix 11.50 doesn't have recursive CTEs (common table expressions). CONNECT BY can help about recursion levels, paths etc., but I can not get expected result using CONNECT BY. Any idea?