Jesus Meant What He Said.
And Jesus did not say, "You have ten fingers, so I give you an 11th thing to juggle."
He said: "I give you A New Commandment," packing up all the other Tenets into one easy to handle capsule called, LOVE.
That one word weighs every possible wrong, in my life or yours-- without condemnation.
With "Love one another," as our point of departure, we cannot kill, lie, steal, adulterate, covet, etc., and not take into account that single precept, of Love.
(*Which incidentally simultaneously would seem to suggest that it IS possible to kill with Love, i.e. euthanasia; steal with Love, e.g. food for your children...?)
Why one-another...?
And not each-other?
The rule in language is that "each" is limited to two, interestingly, and "one another" is in reference to multiples; a reverse it to what we might commonly presume, given the apparent singularity of the latter.
I see the edict as quite poetic, philosophical, and Godly:
...To Love the One, and the One-in-all-the-Others...