function get_all_playoff_games(teams, groups, group_games, cb) {
let replacements = montecarlo(teams, groups, group_games, ['Group A', 'Group B', 'Group C']);
function get_all_playoff_games(teams, groups, group_games, cb) {
let replacements = montecarlo(teams, groups, group_games, ['Group A', 'Group B', 'Group C']);