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(defn CHECKEDGES [G S unexpl BACKTRACK ORDERLIST] ;aux function checking all edges outgoing from vector S
  (if (= (G S) [])
    (if (= BACKTRACK []) 
      [G nil BACKTRACK ORDERLIST] ;nowhere to backtrack anymore new S is nil
      (recur G (peek BACKTRACK) unexpl (pop BACKTRACK)  (conj ORDERLIST S))) ;no more edges to verify, need to backtrack,  add S to orderlist
    ; now if (G S) edges are not empty,  check all vertices
    (let [V (peek (G S))
      newedges (pop (G S))
      newG (assoc G S newedges)] ;new edges are without V anymore

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(ns sc.core
   (:require [clj-http.client :as client]
             [cheshire.core :refer :all]
             [clojure.string]
             [clojure.java.io :as io]))


;; !!!!!
;; FIXED version runs without problems
;; to run those functions you need enter below sound_client_id::::

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package module3;

//Java utilities libraries
import java.util.ArrayList;
//import java.util.Collections;
//import java.util.Comparator;
import java.util.List;

//Processing library
import processing.core.PApplet;

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package co.example.youtube;

/*
Example of how to get user's youtube channel id using google OAuth2,
the app needs to be registered at:
https://console.developers.google.com/apis/
Credentials->Client ID for Android
with the same package name (in this case co.example.youtube)
otherwise error 10 will be received
*/

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//
//  AppDelegate.swift
//  RemoteReceiver
//  Receive remote events from Bluetooth head set or player.
//  Created by michal on 06/11/2018.
//  Copyright © 2018 michal. All rights reserved.
//

import UIKit
import MediaPlayer

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//
//  main.swift
//  MJPEGreader
//
//  Created by michal on 17/11/2017.
//  Copyright © 2018 michal. All rights reserved.
//

import Foundation

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//
//  AudioPlayer.swift
//  AudioPlayerNodes
//
//  Created by michal on 23/01/2019.
//  Copyright © 2019 michal. All rights reserved.
//

import AVFoundation

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import AVFoundation

import UIKit
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true

class AudioPlayer {
    var backgroundAudioFile:AVAudioFile
    var topAudioFiles: [AVAudioFile] = []

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import AVKit
import Photos

func getVideos() -> PHFetchResult<PHAsset> {
        let fetchOptions = PHFetchOptions()
        fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate",ascending: false)]
        fetchOptions.predicate = NSPredicate(format: "mediaType = %d",PHAssetMediaType.video.rawValue)
        return PHAsset.fetchAssets(with: fetchOptions)
}

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import AVFoundation
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true

class AudioPlayer {
    var topAudioFiles: [AVAudioFile] = []
    var engine:AVAudioEngine
    var backgroundAudioNode: AVAudioPlayerNode
    var backgroundAudioFile: AVAudioFile