1. A control system for controlling a text processing machine to verify the presence of an input character string in a dictionary of character strings comprising: means for calculating a magnitude and angle representation for each of N dictionary character strings; means for sorting said magnitude and angle representations into numerical order; a memory buffer of 2N bit locations; means for activating a binary bit of a first polarity in said memory buffer for each of the possible N magnitude representations; means for calculating a modulo N value for each of the N magnitude representations; means for activating a binary bit of a second polarity opposite said first polarity in said memory buffer adjacent each binary bit of said first polarity for each modulo N value calculated; means for storing said angle representations corresponding to said calculated modulo N values; means for receiving an input character string and calculating a magnitude and angle representation for said input character string; means for calculating the modulo N value of the magnitude representation of said input character string; means for scanning said memory buffer for binary bits of said second polarity adjacent said binary bit of said first polarity representing the modulo N value of the input character string magnitude representation; means for synchronously scanning the corresponding angle representations; means for comparing all angle representations corresponding to the binary bit of said second polarity adjacent the binary bit of said first polarity corresponding to the modulo N value of the input word to the input word angle representation; and means for outputting a signal indicating whether the compare is equal or not equal.