Models of rubric: Egyptian fractions Model 1513 Slide: 2/n-Table Model 1514 Slide: 2/n-Table Model 1515 Slide: Regular decompositions Model 1516 Slide: Exception numbers Model 1517 Slide: Exception numbers Model 1518 Slide: Computations for the 2/n table Model 1519 Slide: To the evolutionary history of the 2/n-tables