The Mǎ reading of 12:1, like the grammatically normal (if interpretatively problematic) “and” reading of 9:1, is the likely solution, whereas the later suggestions are ingenuities based on technically possible but contextually awkward construances of one word.

He asked them to use blue for emphasis because the red they were using appeared black due to his protanomaly.

We'll have to throw us food out.

At Coventry, upon Saint Lambert's day: There shall your swords and lances arbitrate The swelling difference of your settled hate