;3.16
;if there are circular references, then there may be problems...
;
;return 3
;+---+---+  +---+---+  +---+---+ 
;| / | --+->| / | --+->| / | / | 
;+---+---+  +---+---+  +---+---+ 
;
;return 4
;+---+---+  +---+---+  +---+---+ 
;| / | --+->| | | --+->| / | / | 
;+---+---+  +-+-+---+  +---+---+ 
;             |          ^
;             |          |
;             +----------+
;
;returns 7                          
;  +-----------+
;  |           |
;  |           V
;+-+-+---+  +---+---+  +---+---+ 
;| | | --+->| | | --+->| / | / | 
;+---+---+  +-+-+---+  +---+---+ 
;             |          ^
;             |          |
;             +----------+
;
;never return
;+---+---+  +---+---+  +---+---+ 
;| / | --+->| / | --+->| | | / | 
;+---+---+  +---+---+  +-+-+---+ 
;             ^          | 
;             |          |
;             +----------+