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graph TD
訂閱 --> 訂閱中
    訂閱中 --> 自動續訂 --> | 長期用戶 | 推廣升級方案
    訂閱中 --> 取消訂閱 --> 提供優惠
    訂閱中 --> 扣款失敗 --> 至AppStore
訂閱 --> 過期
    過期 --> 通知現有優惠

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let musicURL = try! FileManager.default.url(for: .musicDirectory, in: .userDomainMask, appropriateFor: nil, create: false)

let source = musicURL.appendingPathComponent("錄音/原始.wav")
let input = try! AVAudioFile(forReading: source)

let format = input.fileFormat
let destination = musicURL.appendingPathComponent("錄音/複製.wav")
let output = try! AVAudioFile(forWriting: destination, settings: format.settings, commonFormat: format.commonFormat, interleaved: format.isInterleaved)

while input.framePosition < input.length {

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:- set_prolog_flag(verbose, silent).
:- initialization(main).

可整除(X, Y):-
	0 is X mod Y.

有因數(X, Y):-
	可整除(X, Y).
有因數(X, Y):-
	X > Y+1, 

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protocol Init {
    init()
}

extension KeyedDecodingContainer {
    func decode<T: Codable & Init>(_ type: T.Type,
                forKey key: Key) throws -> T {
        try decodeIfPresent(type, forKey: key) ?? .init()
    }
}

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:- set_prolog_flag(verbose, silent).
:- initialization(main).

非質數([X | _], Value):-
    Mod is Value mod X,
    Mod = 0.

非質數([_ | Other], Value):-
    非質數(Other, Value).

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:- set_prolog_flag(verbose, silent).
:- initialization(main).

帳號(學號). 密碼("IMD12345").

登入(Account, Password):-
    帳號(Account), 密碼(Password),
    write("帳號與密碼正確可進行提款"), nl.

登入:-

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extension String {
    subscript(_ i: Int) -> String {
        let idx1 = index(startIndex, offsetBy: i)
        let idx2 = index(idx1, offsetBy: 1)
        return String(self[idx1..<idx2])
    }
    
    subscript (r: Range<Int>) -> String {
        let start = index(startIndex, offsetBy: r.lowerBound)
        let end = index(startIndex, offsetBy: r.upperBound)

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import Combine
import Foundation

struct Version: Codable {
    var stringValue: String
    
    init(rawValue: String) {
        stringValue = rawValue
    }
    init(from decoder: Decoder) throws {

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func combine<Sequence1, Sequence2>(_ sequence1: Sequence1, _ sequence2: Sequence2) -> CombineSequence<Sequence1, Sequence2> {
    return CombineSequence(sequence1, sequence2)
}

struct CombineSequence<Sequence1: Sequence, Sequence2: Sequence> {
    let _sequence1: Sequence1
    let _sequence2: Sequence2
    init(_ sequence1: Sequence1, _ sequence2: Sequence2) {
        (_sequence1, _sequence2) = (sequence1, sequence2)
    }

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import Cocoa
import Foundation

extension String {
    static func ~= (lhs: String, rhs: String) -> Bool {
        if lhs == rhs {
            return true
        }
        if let range = rhs.range(of: lhs, options: .regularExpression) {
            return rhs[range] == rhs