For viewing the example you sent in the other thread you may do: |coll| coll:=OrderedCollection new. (Interval from: 1 to: 100) do: [:each| coll add:( each \\ 2 = 0 ifTrue: [SortedCollection sortBlock:[:a :c | a name < c name] ] ifFalse:[Dictionary new] ) ]. (FLAnalyzer newDefault setDebug; analysisFor: coll) openPathsToEvery: [:o | o isKindOf: SortedCollection ]. Trick: in the case you want to explore the graph traced using FuelMetalevel, you should send #useFullMappers this way: (FLAnalyzer newDefault useFullMappers; setDebug; analysisFor: coll) openPathsToEvery: [:o | o isKindOf: SortedCollection ]. in this case I think will be the same, but in others may differ. FuelPreview is a very new tool, please tell us what can be improved. Cheers, MartÃn