Scope note:
This property associates an instance of E4 Period with another instance of E4 Period that is defined by a subset of the phenomena that define the former. Therefore the spacetime volume of the latter must fall
within the spacetime volume of the former.
This property is transitive.
Examples:
- Cretan Bronze Age (E4) consists of Middle Minoan (E4)
In First Order Logic:
P9(x,y) ⊃ E4(x)
P9(x,y) ⊃ E4(y)
P9(x,y) ⊃ P10(y,x)