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The empty string should not be confused with the empty language ∅, which is a formal language (i.e. a set of strings) that contains no strings, not even the empty string. The empty string has several properties: |ε| = 0. Its string length is zero. ε ⋅ s = s ⋅ ε = s. The empty string is the identity element of the concatenation operation
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The autism rights movement, also known as the autistic acceptance movement, is a social movement within the context of disability rights that emphasizes a neurodiversity paradigm, viewing the autism spectrum as a result of natural variations in the human brain rather than as a disease to be cured.