e/Fokker periodicity blocks

Information
has gloss	eng: Fokker periodicity blocks are a concept in tuning theory used to mathematically relate musical intervals in just intonation to those in equal tuning. They are named after Adriaan Daniël Fokker. These are included as the primary subset of what Erv Wilson refers to as constant structures.
lexicalization	eng: Fokker periodicity blocks
instance of	e/Lattice (group)