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function escapeRegExp(str) {
  return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, '\\$&');
}

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function groupBy(arr, fn) {
  fn = fn || ((o) => o);
  let g = [];
  let v = [];
  for (let i = 0; i < arr.length; ++i) {
    let val = fn(arr[i]);
    let idx = g.indexOf(val);
    if (idx === -1) {
      g.push(val);

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// Flatten array from desired level

let flattenArray = function(arr, lvl = 0) {
  if (!(arr instanceof Array)) return lvl === 0 ? arr : [arr];
  if (lvl > 0) {
    return arr.map((el) => flattenArray(el, lvl-1));
  } else {
    return arr.reduce((arr, el) => {
      return arr.concat(flattenArray(el, lvl-1));
    }, []);

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let Generator = (function*(){}).constructor;

// function Generator(...a) {
//   let [args, body] = a;
//   if (a.length === 0) [args, body] = [[], ''];
//   if (a.length === 1) [args, body] = [[], a[0]];
//   return new Function(`return function*(${args.join(',')}){${body}};`)();
// }

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function pascalsTriange(depth) {
  let last = [1];
  let res = [];
  for (let i = 0; i < depth; i++) {
    let n = [];
    for (let j = 0; j < i + 1; j++) {
      n[j] = (last[j-1] || 0) + (last[j] || 0);
    }
    res.push(n);
    last = n;

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const flatten = arr => arr.reduce((res, el) => [...res, ...(Array.isArray(el) && flatten(el) || [el])], [])

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// get skin names from this address
// http://www.agarioguide.com/skins/
$$('.wp-caption-text span').map(el=>el.innerHTML).join('|');

// declare skin names:
let skins = '2ch.hk|4chan|8ch|9gag|Argentina|France|Austria|ayy lmao|Bait|Bangladesh|Belgium|Bosnia|Botswana|Brazil|Bulgaria|Byzantium|Cambodia|Canada|Chile|China|cia|Confederate|Croatia|Denmark|Doge|ea|Earth|Estonia|European Union|German Empire|Germany|Greece|Hitler|Hong Kong|Hungary|Imperial Japan|India|Indiana|Indonesia|Iran|Iraq|Ireland|Facepunch|Italy|Jamaica|Japan|KC|Latvia|Lithuania|Luxembourg|Maldivas|Mars|Matriarchy|Mexico|Moon|NASA|Agario|Netherlands|Nigeria|Receita Federal|North Korea|Norway|Origin|Pakistan|Patriarchy|Peru|Pewdiepie|Piccolo|Facebook|Pokerface|Poland|Portugal|Prodota|Prussia|Qing Dynasty|Quebec|IRS|Reddit|Romania|Russia|Sanik|Satanist|Scotland|Sealand|Sir|French Kingdom|Steam|Feminism|Finland|Stussy|Sweden|Switzerland|Taiwan|Texas|Thailand|Tsarist Russia|Tumblr|Australia|Austria|Turkey|Ukraine|United Kingdom|USA|USSR|Vinesauce|

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function transpose(arr) {
  let [h, w] = [arr.length, arr[0].length];
  let res = [];
  for (let x = 0; x < w; ++x) {
    res[x] = [];
  }
  for (let y = 0; y < h; ++y) {
    for (let x = 0; x < w; ++x) {
      res[x][y] = arr[y][x];
    }

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// https://www.bitmarket.pl/graphs/BTCPLN/depth.svg
alert([].map.call(document.querySelectorAll('.legend'),n=>n.innerHTML).filter(t=>t[0]=='Σ').join`\n`)

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var deepEach = function callee(obj, fn, chain) {
  chain = chain && chain + '.' || '';
  // chain += '.';
  for (var i in obj) {
    if (obj.hasOwnProperty(i)) {
      if (typeof obj[i] === 'object') {
        callee(obj[i], fn, chain + i);
      } else {
        fn(obj[i], i, chain + i);
      }