import System.Collections.*
import System.Linq.*
import System.Console.*

public func Pair(value: int) -> Iterable<int> {
    return [value, value * 10]
}

func Main() {
    let values: int[] = [1, 2, 3, 4]
    let page = values.Skip(1).Take(2)
    for value in page {
        WriteLine(value)
    }

    if values.Any(value => value > 3) {
        WriteLine("True")
    }
    if values.All(value => value > 0) {
        WriteLine("True")
    }
    WriteLine(values.Count(value => value > 2))
    WriteLine(values.Fold(0, (total, value) => total + value))

    let extra: int[] = [5]
    for value in page.Concat(extra).FlatMap(value => Pair(value)) {
        WriteLine(value)
    }
}