private List<Unit> getUnits(List<Unit> nonBannerUnits, List<Unit> bannerUnits, String pullType){
        final double bannerRainbow = 1;
        final double offRainbow = bannerRainbow + 2;
        final double bannerGold = offRainbow + 4.75;
        final double offGold = bannerGold + 13.25;
        final double bannerBlue = offGold + 20;
        final double offBlue = bannerBlue + 58;

        final double specialBannerRainbow = 3.75;
        final double specialOffRainbow = specialBannerRainbow + 1.25;
        final double specialBannerGold = specialOffRainbow + 47.5;
        final double specialOffGold = specialBannerGold + 47.5;
        Random r = new Random();

        List<Unit> result = null;
        if(pullType.equals("10+1 premium")) {
            result = new LinkedList<Unit>();
            for(int i = 0; i < 11; i++)
                result.addAll(getUnits(nonBannerUnits, bannerUnits, "4*ex"));
        }
        else if(pullType.equals("10+1")) {
            result = new LinkedList<Unit>();
            result.addAll(getUnits(nonBannerUnits, bannerUnits, "4*"));
            for(int i = 0; i < 10; i++)
                result.addAll(getUnits(nonBannerUnits, bannerUnits, "3*"));
        }
        else if(pullType.equals("5*")) {
            double luck = specialOffRainbow * r.nextDouble();
            if(luck < specialBannerRainbow)
                result = bannerUnits.stream().filter(u -> u.getMinRarity() == 5L).collect(Collectors.toList());
            else
                result = nonBannerUnits.stream().filter(u -> u.getMinRarity() == 5L).collect(Collectors.toList());
            Collections.shuffle(result);
            result = result.subList(0, 1);
        }
        else if(pullType.equals("5*ex") || pullType.equals("5* ex")) {
            result = Stream.concat(bannerUnits.stream(), nonBannerUnits.stream()).filter(u -> u.getMinRarity() == 5L).collect(Collectors.toList());
            Collections.shuffle(result);
            result = result.subList(0, 1);
        }
        else if(pullType.equals("4*")) {
            double luck = 100 * r.nextDouble();
            if(luck < specialBannerRainbow)
                result = bannerUnits.stream().filter(u -> u.getMinRarity() == 5L).collect(Collectors.toList());
            else if(luck < specialOffRainbow)
                result = nonBannerUnits.stream().filter(u -> u.getMinRarity() == 5L).collect(Collectors.toList());
            else if(luck < specialBannerGold)
                result = bannerUnits.stream().filter(u -> u.getMinRarity() == 4L).collect(Collectors.toList());
            else if(luck < specialOffGold)
                result = nonBannerUnits.stream().filter(u -> u.getMinRarity() == 4L).collect(Collectors.toList());
            else
                result = nonBannerUnits.stream().filter(u -> u.getMinRarity() == 4L).collect(Collectors.toList());
            Collections.shuffle(result);
            result = result.subList(0, 1);
        }
        else if(pullType.equals("4*ex") || pullType.equals("4* ex")) {
            double luck = 100 * r.nextDouble();
            if(luck < (specialBannerRainbow + specialOffRainbow))
                result = Stream.concat(bannerUnits.stream(), nonBannerUnits.stream()).filter(u -> u.getMinRarity() == 5L).collect(Collectors.toList());
            else if(luck < (specialBannerGold + specialOffGold))
                result = Stream.concat(bannerUnits.stream(), nonBannerUnits.stream()).filter(u -> u.getMinRarity() == 4L).collect(Collectors.toList());
            else
                result = Stream.concat(bannerUnits.stream(), nonBannerUnits.stream()).filter(u -> u.getMinRarity() == 4L).collect(Collectors.toList());
            Collections.shuffle(result);
            result = result.subList(0, 1);
        }
        else if(pullType.equals("3*") || pullType.equals("daily")) {
            double luck = 100 * r.nextDouble();
            if(luck < bannerRainbow)
                result = bannerUnits.stream().filter(u -> u.getMinRarity() == 5L).collect(Collectors.toList());
            else if(luck < offRainbow)
                result = nonBannerUnits.stream().filter(u -> u.getMinRarity() == 5L).collect(Collectors.toList());
            else if(luck < bannerGold)
                result = bannerUnits.stream().filter(u -> u.getMinRarity() == 4L).collect(Collectors.toList());
            else if(luck < offGold)
                result = nonBannerUnits.stream().filter(u -> u.getMinRarity() == 4L).collect(Collectors.toList());
            else if(luck < bannerBlue)
                result = bannerUnits.stream().filter(u -> u.getMinRarity() == 3L).collect(Collectors.toList());
            else if(luck < offBlue)
                result = nonBannerUnits.stream().filter(u -> u.getMinRarity() == 3L).collect(Collectors.toList());
            else
                result = nonBannerUnits.stream().filter(u -> u.getMinRarity() == 3L).collect(Collectors.toList());
            Collections.shuffle(result);
            result = result.subList(0, 1);
        }
        else if(pullType.equals("3*ex") || pullType.equals("3* ex")) {
            double luck = 100 * r.nextDouble();
            if(luck < (bannerRainbow + offRainbow))
                result = Stream.concat(bannerUnits.stream(), nonBannerUnits.stream()).filter(u -> u.getMinRarity() == 5L).collect(Collectors.toList());
            else if(luck < (bannerGold + offGold))
                result = Stream.concat(bannerUnits.stream(), nonBannerUnits.stream()).filter(u -> u.getMinRarity() == 4L).collect(Collectors.toList());
            else if(luck < (bannerBlue + offBlue))
                result = Stream.concat(bannerUnits.stream(), nonBannerUnits.stream()).filter(u -> u.getMinRarity() == 3L).collect(Collectors.toList());
            else
                result = Stream.concat(bannerUnits.stream(), nonBannerUnits.stream()).filter(u -> u.getMinRarity() == 3L).collect(Collectors.toList());
            Collections.shuffle(result);
            result = result.subList(0, 1);
        }
        return result;
    }