I don't use cells for beans. You can make paper pots from newspaper for these or toilet roll tubes.
https://www.youtube.com/watch?v=lP5Fa6A5lFM
I use multi purpose compost, didn't really like coir.
https://www.youtube.com/watch?v=lP5Fa6A5lFM
I use multi purpose compost, didn't really like coir.

Each label is positioned to tell me which seeds are where in the tray, so everything in front of the writing has those seeds. It means I can plant several different things in one lot of modules and know which is which. 
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