ε ⋅ s = s ⋅ ε = s. The empty string is the identity element of the concatenation operation. The set of all strings forms a free monoid with respect to ⋅ and ε. ε R = ε. Reversal of the empty string produces the empty string. The empty string precedes any other string under lexicographical order, because it is the shortest of all strings.
The (/ ð ə, ð iː / ()) is a grammatical article in English, denoting persons or things already mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers.
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Understanding your money management options as an expat living in Germany can be tricky. From opening a bank account to insuring your family’s home and belongings, it’s important you know which options are right for you. To find out how you can make your money go further, read our guides to finance in Germany.
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Jan 31, 2022 · FOX FILES combines in-depth news reporting from a variety of Fox News on-air talent. The program will feature the breadth, power and journalism of rotating Fox News anchors, reporters and producers.