4->5:
https://i.gyazo.com/136c2e009895af4afafaf9278d62d68d.png
2 ->3:
https://i.gyazo.com/080d22737ab4d4635c1e7ecd4aa8213d.png
https://i.gyazo.com/c7dd46650c80e7d721b26ba159d1d981.png
EDIT: one more recipe, 3->4:
http://cdn-frm-eu.wargaming.net/wot/ru/uploads/monthly_12_2016/post-28251388-0-85019300-1482749629.jpg
