`s` precondition need to be checked

[github-actions]

https://api.github.com/maxeeem/NARS-Swift/blob/21e4bc99fdc21b3530cb9bbc57d91b1ec63305be/Code.playground/Sources/NARS/NARS.swift#L256

                }
            }
            
        }
    }
    
    // MARK: - CYCLE
    
    private func cycle() {
        guard var concept = memory.get() else {
            return // no concepts in memory
        }
        
        let results = concept.cycle()
                    
        if let derived = results["Judgement"] {            
            for j in derived {
                buffer.put(Task(sentence: .judgement(j)))
            }
        }
        
        if let answers = results["Question"] {

            if answers.first?.statement == .NULL {

                // TODO: finish this !!!
                
                for var chunk in answers.split(separator: .NULL-*) {
                    let source = chunk.removeFirst()
                    chunk.reversed().forEach { j in
                        let q1 = Sentence.question(Question(j.statement, source))
                        buffer.put(Task(sentence: q1))
                    }
                }
                
            } else {
                for a in answers {
                    output(". 💡 \(a)")
                }
            }

        }
        
        if let answers = results["Goal"] {

//            print("A\n", answers, "\n")
            if let a = answers.first {
                if case .statement(let sub, let cop, _) = a.statement {
                    if cop == .predictiveImp { // TODO: needs to be done properly
                        // subject is the subgoal
                        if case .statement(_, let c, let p) = sub {
                            // TODO: how to check preconditions?
                            if c == .predictiveImp { // TODO: `s` precondition need to be checked
                                if case .operation(let op, let ts) = p {
                                    output(". 🤖 \(p)")
                                    if let operation = operations[op] {
                                        let result = operation(ts) // execute
                                        output(result.description)
                                    } else {
                                        output("Unknown operation \(op)")
                                    }
                                }
                            } else {
                                let gs = Goal(sub)
                                buffer.put(Task(sentence: .goal(gs)))
                            }
                        }
                    }
                }
            }
        }
        
        // decrease priority
        concept.priority = max(concept.priority - 0.01, 0.01)

        // storage
        memory.put(concept)
    }
        
}