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=begin

3,5,2,7,1

  3
 2 5
1   7

=end

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package main

import (
  "fmt"
  "log"
  "net"
  "sync"
  "time"
  "strings"
  "runtime"

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import re

def expand_hadoop_path(path):
   brace_patterns = re.findall('{{[^}]+}}', path)
   brace_patterns_values = [(brace_pattern, brace_pattern.replace('{{','').replace('}}','').split(',')) for brace_pattern in brace_patterns]

   replacements = []

   for (brace_pattern, values) in brace_patterns_values:
      if replacements:

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import os
import boto3
import subprocess
import configargparse

SSH_USER = 'hadoop'
SSH_TEMPLATE = 'ssh -o StrictHostKeyChecking=no -i {ssh_key} {ssh_user}@{host} "{cmd}"'
SSH_KEY_PATH = os.path.expanduser('~/.ssh')

def find_ssh_key(emr, config):

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import requests._
import org.json4s._
import org.json4s.jackson.{JsonMethods => Json}
import org.json4s.JsonDSL.WithBigDecimal._

import scala.concurrent._
import scala.concurrent.duration._
// import ExecutionContext.Implicits.global

import java.lang.Runtime

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// Permutations are using all elements in the sequence
import scala.collection.mutable.ArrayBuffer


// Mutable version
def permutationsM[T](s: Seq[T]): Seq[Seq[T]] = {
   if (s.length < 2) {
      Seq(s)
   } 
   else if (s.length == 2) {