The TSA concatenates a timestamp to the hash and calculates the hash of this concatenation. Numerical linear algebra characteristically approaches matrices as a concatenation of columns vectors. String operators included substring selection, concatenation, assignment, and testing for equality. Also, there is no operator or command for string concatenation, as the language concatenates directly. In Perl and PHP, the dot is the string concatenation operator. String interpolation, like string concatenation, may lead to security problems. The descriptor is the concatenation of these histograms. Note, string concatenation and regular expressions are handled in separate pages. The normal forms are not closed under string concatenation. Primes that are the concatenation of the first "n" primes written in decimal. The valid 9-bit result is the concatenation of the carry flag with the result. Various operations, such as copying, concatenation, tokenization and searching are supported. This eases the concatenation of multiple hex files. The stream content is the concatenation of its pages, truncated to the stream's length. It was published in 2001 that PTIME corresponds to (positive) range concatenation grammars.