my $%words2ids = (
    ulimi => '<ZUL-SIL-0017-n>',
    izinyo => {
        '' => '<ZUL-SIL-0018-n>', # no known word follows
        lomhlathi => '<ZUL-SIL-0019-n>',
    },

    ingemuva => {
        lomqala => '<ZUL-SIL-0024-n>',
    },
);