This invention teaches that a single auxiliary key 1006 can support a multiplicity of ordered groups 1003-1004 and that only a subset of each group 1003-1004 needs to be visually represented on the face of a key, and that either multi-tap or predictive methods, or both, can be used to input members of each groups, and that auxiliary keys 1005-1007 are a convenient and effective method to select ordered groups, and to perform the multi-tap function. This invention teaches: limited multi-tap depth, reduced keystrokes per symbol, discoverability, graduated discoverability, compact presentation, and seamless integration of multi-tap and predictive methods.