040000 tree 90789712d5a8eb1864b75c5d32dadb2291dbc5fd	core
040000 tree f5cc2e9d61ba736053221a4ad704380634ebca8c	facade
040000 tree eb4e64a047a9604c7ee479db36ae2b91fb23f398	features
040000 tree 8f508cd8388d433f1a06ad741ff867b34c745af9	testing