4. The method of claim 3 , further comprising: receiving a user selection of a first selectable indicator; and determining, from a third subsequence of characters, one or more second input candidates in the third writing system, where the third subsequence includes all the second subsequences in the order in which they occur in the input sequence up to the particular second subsequence identified by the first selectable indicator.
4. The method of claim 3 , further comprising: receiving a user selection of a first selectable indicator; and determining, from a third subsequence of characters, one or more second input candidates in the third writing system, where the third subsequence includes all the second subsequences in the order in which they occur in the input sequence up to the particular second subsequence identified by the first selectable indicator. 5. The method of claim 4 , further comprising: displaying the one or more second input candidates as selectable alternatives to the third subsequence of characters instead of the first input candidates.