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This is something I've stumbled upon which some of you may or may not know about this. Nevertheless, depending on how many enemies you kill with your very first bomb decides how many you will get on the next level. i.e if you kill three enemies on PD 5 then you can collect three different types of on PD 6.
If you do manage do take out seven enemies on a level then it is possible to collect all letters but it's not without risk.