Environment: [x = {a}.🐶, 🐶 =({a}.nill + {b}.nill)]
Initial Entities: {a, b}
Context: [({a,b}.{a}.{a,c}.x + {a,b}.{a}.{a}.nil)]
Reactions: ([r: {a,b}, i: {c}, p: {b, 😵}])