13. The apparatus of claim 12 wherein said word ending means further includes: alpha table means addressed by a modified data unit for storing and reading out, when addressed, a second data unit, third comparing means for comparing contents of said alpha sequence accumulator means with said second data unit, means for incrementing said alpha table means to obtain a third data unit, test means to test for one or another test on said third data unit depending on the outcome of said third comparison, means for extracting a representation of said selected word ending from said third data unit if said third comparison is favorable and said one test is passed, and a first entry register, and means to store in said first entry register a representation of a first character of a word and means to clear said first entry register on actuation of a selected sub-set of keys of said keyboard means.
13. The apparatus of claim 12 wherein said word ending means further includes: alpha table means addressed by a modified data unit for storing and reading out, when addressed, a second data unit, third comparing means for comparing contents of said alpha sequence accumulator means with said second data unit, means for incrementing said alpha table means to obtain a third data unit, test means to test for one or another test on said third data unit depending on the outcome of said third comparison, means for extracting a representation of said selected word ending from said third data unit if said third comparison is favorable and said one test is passed, and a first entry register, and means to store in said first entry register a representation of a first character of a word and means to clear said first entry register on actuation of a selected sub-set of keys of said keyboard means. 14. The apparatus of claim 13 which further includes exception table means, means to address said exception table means with said third data unit, if said third comparison is favorable and said one test is not passed, fourth comparison means for comparing a fourth data unit from said exception table means with contents of said first entry register, and means, responsive to a favorable result of said fourth comparison for extracting, from said exception table means, a representation of said selected word ending.