fly_all.txt: size > 2, density > .67. 5 clusters.

Cluster #0. Size 5. Density 0.700000.
CG17161 CG17765 CG30147 CG4641 CG7001 
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Cluster #1. Size 4. Density 0.833333.
CG10419 CG16725 CG6539 CG8556 
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Cluster #2. Size 3. Density 1.000000.
CG16886 CG4835 CG9975 
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Cluster #3. Size 3. Density 1.000000.
CG10949 CG14315 CG6683 
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Cluster #4. Size 3. Density 1.000000.
CG15845 CG18675 CG6607 
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