1. A method, comprising: detecting, via a user input device as part of user entry of a sub-sequence of a sequence of symbols of a target string, a user-encoded target length of the target string, where the target length encoded by the user is greater than a length of the sub-sequence and the sub-sequence comprises at least a first character of the sequence of symbols of the target string; associating, in response to detecting the target length of the target string encoded by the user via the user input device as part of the user entry of the sub-sequence, a set of eligible strings of a predefined vocabulary with the sub-sequence, each eligible string comprising the sub-sequence and comprising a length corresponding to the target length encoded by the user as part of the user entry of the sub-sequence; and enabling user selection of one of the eligible strings via the user input device as the target string.
1. A method, comprising: detecting, via a user input device as part of user entry of a sub-sequence of a sequence of symbols of a target string, a user-encoded target length of the target string, where the target length encoded by the user is greater than a length of the sub-sequence and the sub-sequence comprises at least a first character of the sequence of symbols of the target string; associating, in response to detecting the target length of the target string encoded by the user via the user input device as part of the user entry of the sub-sequence, a set of eligible strings of a predefined vocabulary with the sub-sequence, each eligible string comprising the sub-sequence and comprising a length corresponding to the target length encoded by the user as part of the user entry of the sub-sequence; and enabling user selection of one of the eligible strings via the user input device as the target string. 10. The method according to claim 1 , where detecting, via a user input device as part of user entry of a sub-sequence of a sequence of symbols of a target string, a user-encoded target length of the target string comprises: detecting user entry via the user input device of a number that specifies the target length followed by a single letter; and assigning the detected number of characters as the target length.