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2. Directed graph - Wikipedia

   en.wikipedia.org/wiki/Directed_graph

   In formal terms, a directed graph is an ordered pair G = (V, A) where [1]. V is a set whose elements are called vertices, nodes, or points;; A is a set of ordered pairs of vertices, called arcs, directed edges (sometimes simply edges with the corresponding set named E instead of A), arrows, or directed lines.

3. Four-square cipher - Wikipedia

   en.wikipedia.org/wiki/Four-square_cipher

   The use of digraphs makes the four-square technique less susceptible to frequency analysis attacks, as the analysis must be done on 676 possible digraphs rather than just 26 for monographic substitution. The frequency analysis of digraphs is possible, but considerably more difficult - and it generally requires a much larger ciphertext in order ...

4. Complete graph - Wikipedia

   en.wikipedia.org/wiki/Complete_graph

   A complete digraph is a directed graph in which every pair of distinct vertices is connected by a pair of unique edges (one in each direction). [ 1 ] Graph theory itself is typically dated as beginning with Leonhard Euler 's 1736 work on the Seven Bridges of Königsberg .

5. Graph theory - Wikipedia

   en.wikipedia.org/wiki/Graph_theory

   A directed graph or digraph is a graph in which edges have orientations. In one restricted but very common sense of the term, [ 5 ] a directed graph is an ordered pair G = ( V , E ) {\displaystyle G=(V,E)} comprising:

6. Digraph (orthography) - Wikipedia

   en.wikipedia.org/wiki/Digraph_(orthography)

   In Welsh, the digraph ll fused for a time into a ligature.. A digraph (from Ancient Greek δίς (dís) 'double' and γράφω (gráphō) 'to write') or digram is a pair of characters used in the orthography of a language to write either a single phoneme (distinct sound), or a sequence of phonemes that does not correspond to the normal values of the two characters combined.

7. Annuity vs 401(k): Which Vehicle Is Actually Better for Your ...

   www.aol.com/annuity-vs-401-k-vehicle-202514980.html

   A strategy is available to roll your 401(k) to a tax-free annuity and ensure you have a steady income stream during retirement. This idea would be advantageous if you have concerns about your ...