Wow that's a handy guide. Where can I get it? I think you are correct.
https://3.bp.blogspot.com/-ySd4Pqfh9jI/W7nyaQ2B6iI/AAAAAAABNI8/TKSeVbReYdMTilnM6ve8iZpy3HKWDQlBwCLcBGAs/s1600/28125538_10214657403766265_1115489988_o.jpg
Here is the large version. Found it when I was looking for an Alan myself at the start of summer.
@dwatt started
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Wow that's a handy guide. Where can I get it?
I think you are correct.