SQEMA

Legend:
Variable names start with a small latin letter and can contain small latin letters and numbers.
Names starting with a small letter 'c' are considered nominals.
#   - - Necessity
@   - - Possibility
#'  - ^-1 - Reversed Necessity
@'  - ^-1 - Reversed Possibility
[n] - Necessity with relation index, where n is a number
<n> - Possibility with relation index, where n is a number
[n]'- Reversed Necessity with relation index, where n is a number
<n>'- Reversed Possibility with relation index, where n is a number
&   - - Conjunction
|   - - Disjunction
~   - - Negation
->  - Implication
<-  - Reversed Implication
<-> - Equivalence