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later in the week of the 50th  email address:
( z0 week :mod ( z1 address :mod ( z2 email ) :ord ( z3 ordinal-entity :value 50 ) ) :time ( z4 after ) )
(z0 / week
    :mod (z1 / address
             :mod (z2 / email-01)
             :ord (z3 / ordinal-entity
                      :value 50))
    :time (z4 / after))
later in the week of the 50th email address :
z0 :time z4
z3 :value 0
z1 :mod z2
z1 :ord z3
z0 :mod z1