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internal class CustomGraphicsView : GraphicsView
{
    // TODO workaround since binding doesn't work yet on IDrawable/GraphicsView
    // https://github.com/dotnet/maui/issues/20991
    protected override void OnBindingContextChanged()
    {
        base.OnBindingContextChanged();

        if (BindingContext is not null)
        {

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public async Task<TokenResponse> GetTokenResponse()
{
    var raw = Task.Run(async () => await SecureStorage.GetAsync(KeyTokenResponse)).Result 
        ?? throw new InvalidOperationException($"'{nameof(TokenResponse)}' not found");
    using var stream = new MemoryStream(Encoding.UTF8.GetBytes(raw), false);
    return await JsonSerializer.DeserializeAsync<TokenResponse>(stream)
        ?? throw new InvalidOperationException($"Cannot deserialize '{nameof(TokenResponse)}'");
}

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class SecretSong {
    constructor(items) {
        this.items = items || [];
        this.lyrics = '';
        this.itemsGiven = [];
    }
    init() {
        let when = atob('T24gdGhl');
        let verb = atob('ZGF5IG9mIENocmlzdG1hcyBteSB0cnVlIGxvdmUgc2VudCB0byBtZTo=');
        const from = atob('ZG92ZXMsIGE='), to = atob('ZG92ZXMsIGFuZCBh');

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using System.Numerics;

string ToWords(BigInteger number)
{
    var ones = new string[] { "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
    var teens = new string[] { "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" };
    var xty = new string[] { "twenty", "thirty", "fourty", "fifty", "sixty", "seventy", "eighty", "ninety" };
    var suffixes = new string[] {
        "", "thousand", "million", "billion", "trillion", 
        "quadrillion", "quintillion", "sextillion", "septillion", 

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string[] ones = { "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten" };
string[] teens = { "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" };
string[] tens = { "", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety" };
string[] suffixes = { "thousand", "million", "billion", "trillion", "quadrillion", "quintillion", "sextillion" };

string NumberToWords(ulong number)
{
    if (number >= 1 && number <= 10)
    {
        return ones[number - 1];

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string ToOnes(long number)
{
    if (number == 0)
    {
        return "";
    }

    var words = new string[] { "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };

    return words[number - 1];

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fun tryEncode(url: String): URL {
    val schemeSeparator = "://"
    val schemeIndex = url.indexOf(schemeSeparator)
    val scheme: String
    val urlWithoutScheme: String
    if (schemeIndex > 0) {
        scheme = url.substring(0, schemeIndex)
        urlWithoutScheme = url.substring(schemeIndex + schemeSeparator.length)
    }
    else {

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public static class BindableHelper
{
    private const string KnownPropertyPattern = "Property";

    public static BindableProperty CreateProperty<T>(
        T? defaultValue = default,
        BindingMode mode = BindingMode.TwoWay,
        BindableProperty.BindingPropertyChangedDelegate? propertyChanged = null,
        [CallerMemberName] string? propertyName = null)
    {

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// interface
interface IActivityInstanceProvider {
    fun updateInstance(activity: Activity)
    fun <TActivity: Activity> get(): TActivity?
}

// class
class ActivityInstanceProvider: IActivityInstanceProvider {

    private val activityInstance: HashSet<WeakReference<Activity?>> = hashSetOf()

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internal class ObservableCollectionAndItems<TModel> where TModel : INotifyPropertyChanged
{
    private readonly ObservableCollection<TModel> collection = new();

    public event EventHandler<EventArgs>? ItemChanged;
    public event EventHandler<NotifyCollectionChangedEventArgs>? CollectionChanged;

    public ObservableCollectionAndItems()
    {
        collection.CollectionChanged += Collection_CollectionChanged;