concept: possible-impossible-necessary

concept: https://vernacular.cloud/t3w607rTDOZ8NFlhz3ok87PY/
this version: https://vernacular.cloud/0.0.4/t3w607rTDOZ8NFlhz3ok87PY/

Broader

• category
• CONTINGENCY
• device

Narrower

• possible
• impossible
• necessary