Left Descent Assemblies are Sieving Elements

-- recall Sieve of Eratosthenes to identify primes and composites

-- here we want to identify integers in the abstract predecessor tree (hoping to find all present)

-- the n of dn + c gives the instantiation of an l.d.a.

-- the headers of l.d.a.s sieve in the {8n+5} subset of integers

-- a (very large) file of l.d.a. element formulas was prepared, and works as far as it went

-- the sieve can be a priori (like Eratosthenes')
         for each surviving odd number, IDit, sieve whole l.d.a. set, and repeat

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