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== Definitions and theorems ==
== Definitions and theorems ==
Throughout, let ''S'' be a scale word in steps ''x'', ''y'', ''z'' (and assume all three of these letters are used).
Throughout, let ''S'' be a scale word in steps ''x'', ''y'', ''z'' (and assume all three of these letters are used).
=== PMOS ===
=== Definition: PMOS ===
Definition: ''S'' is ''pairwise MOS'' (PMOS) if the result of equating any two of the step sizes is a MOS.
''S'' is ''pairwise MOS'' (PMOS) if the result of equating any two of the step sizes is a MOS.
=== AG ===
=== Definition: AG ===
Definition: ''S'' satisfies the ''alternating generator property'' (AG) if it satisfies the following equivalent properties:  
''S'' satisfies the ''alternating generator property'' (AG) if it satisfies the following equivalent properties:  
# ''S'' can be built by stacking alternating generators, resulting in a circle of the form  either g1 g2 ... g1 g2 g1 g3 or g1 g2 ... g1 g2 g3.
# ''S'' can be built by stacking alternating generators, resulting in a circle of the form  either g1 g2 ... g1 g2 g1 g3 or g1 g2 ... g1 g2 g3.
# ''S'' is generated by two chains of generators separated by a fixed interval; either both chains are of size ''m'', or one chain has size ''m'' and the second has size ''m-1''.
# ''S'' is generated by two chains of generators separated by a fixed interval; either both chains are of size ''m'', or one chain has size ''m'' and the second has size ''m-1''.