Long description

Three iterations are shown here, labeled iteration 0, iteration 1 and iteration 2. Iteration 0: Four blocks labeled StartFraction 1 over 4 EndFraction "A", StartFraction 1 over 4 EndFraction B, StartFraction 1 over 4 EndFraction C, and StartFraction 1 over 4 EndFraction D, are shown on iteration 0. An arrow from StartFraction 1 over 4 EndFraction B points to StartFraction 1 over 4 EndFraction "A", and another arrow from StartFraction 1 over 4 EndFraction B points to StartFraction 1 over 4 EndFraction D. An arrow from StartFraction 1 over 4 EndFraction D points to StartFraction 1 over 4 EndFraction C, and an another arrow from StartFraction 1 over 4 EndFraction D points to StartFraction 1 over 4 EndFraction "A". Three arrows from StartFraction 1 over 4 EndFraction C points to StartFraction 1 over 4 EndFraction "A", StartFraction 1 over 4 EndFraction B and StartFraction 1 over 4 EndFraction D. Iteration 1: Four blocks labeled StartFraction 1 over 3 EndFraction "A", StartFraction 1 over 12 EndFraction B, StartFraction 1 over 8 EndFraction C, and StartFraction 5 over 24 EndFraction D, are shown on iteration 1. An arrow from StartFraction 1 over 12 EndFraction B points to StartFraction 1 over 3 EndFraction "A", and another arrow from StartFraction 1 over 12 EndFraction B points to StartFraction 5 over 24 EndFraction D. An arrow from StartFraction 5 over 24 EndFraction D points to StartFraction 1 over 8 EndFraction C, and an another arrow from StartFraction 5 over 24 EndFraction D points to StartFraction 1 over 3 EndFraction "A". Three arrows from StartFraction 1 over 8 EndFraction C points to StartFraction 1 over 3 EndFraction "A", StartFraction 1 over 12 EndFraction B and StartFraction 5 over 24 EndFraction D. Iteration 2: Four blocks labeled StartFraction 9 over 48 EndFraction "A", StartFraction 1 over 24 EndFraction B, StartFraction 5 over 48 EndFraction C, and StartFraction 1 over 12 EndFraction D, are shown on iteration 2. An arrow from StartFraction 1 over 24 EndFraction B points to StartFraction 9 over 48 EndFraction "A", and another arrow from StartFraction 1 over 24 EndFraction B points to StartFraction 1 over 12 EndFraction D. An arrow from StartFraction 1 over 12 EndFraction D points to StartFraction 5 over 48 EndFraction C, and an another arrow from StartFraction 1 over 12 EndFraction D points to StartFraction 15 over 48 EndFraction "A". Three arrows from StartFraction 5 over 48 EndFraction C points to StartFraction 9 over 48 EndFraction "A", StartFraction 1 over 24 EndFraction B and StartFraction 1 over 12 EndFraction D. An arrow from iteration 0 points to iteration 1 and an arrow from iteration 1 points to iteration 2.