The B.1.351 variant first found in South Africa was labeled as Beta, the P.1 variant first discovered in Brazil became Gamma and the B.1.617.2 variant first detected in India is now Delta. The next letters on the list, if it comes to it, which it probably will, are epsilon, zeta, eta and theta. B.1.1.7, for instance, will remain a label for the variant first discovered in the United Kingdom and will also be known as Alpha. Currently, there are no plans on how to label the variants after the 24 letters of the Greek alphabet are used up. B.1.617.2, for example, which has contributed to a deadly surge in India, has been named Delta under the new system.
400 words would be listed as best description of adding another 1000 letters to the alphabet.
( z0 list :ARG1 ( z1 word :quant 400 ) :ARG2 ( z2 describe :ARG1 ( z3 add :ARG1 ( z4 letter :quant 1000 :mod ( z5 another ) ) :ARG2 ( z6 alphabet ) ) :ARG1-of ( z7 have-degree :ARG2 ( z8 good :ARG1 z2 ) :ARG3 ( z9 most ) ) ) )
(z0 / list-01
    :ARG1 (z1 / word
              :quant 400)
    :ARG2 (z2 / describe-01
              :ARG1 (z3 / add-02
                        :ARG1 (z4 / letter
                                  :quant 1000
                                  :mod (z5 / another))
                        :ARG2 (z6 / alphabet))
              :ARG1-of (z7 / have-degree-91
                           :ARG2 (z8 / good-02
                                     :ARG1 z2)
                           :ARG3 (z9 / most))))
400 words would be listed as best description of adding another 1000 letters to the alphabet .
z1 :quant 1
z0 :ARG1 z1
z7 :ARG2 z8
z7 :ARG3 z9
z8 :ARG1 z2
z2 :ARG1-of z7
z0 :ARG2 z2
z2 :ARG1 z3
z4 :quant 0
z4 :mod z5
z3 :ARG1 z4
z3 :ARG2 z6