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\section{Vectors of Bits}\label{Sec:Vectors}  With If we have  only one bit at disposal,  we cannot doso  much. In general the computer deals \\  Usually, computers, have to work  with sequences of bits, that are ``ordered set'', set''.  These sequences,  called {\em vectors}, vectors} by Mathematicians, are  commonly defined {\em arrays} or {\em strings} in by  Computer Science. Known vectors Scientists.  \\  Some  of bits are: nibbles that these strings  are (vectors particularly important for applications, so they have their own name. They are:  \begin{itemize}  \item \emph{nibbles}: vectors  of $4$ bits); bytes bits;  \item \emph{bytes}:  vectors of $8$ bits and so on. \end{itemize}  In general we call \emph{stream} a vector whose exact size is not known \emph{a priori}. priori\\  We will usually visualize them as blocks of one-bit bricks:  \begin{center}  \begin{tabular}{ |c | c | c | c | c | c |}