Other than a table, you're limited to using tabs to separate the examples - and having to input the b) & c), etc manually - or a multi-column layout. The latter, though will mean your example lettering will run down then across, rather than the across then down that you now have. You'll also need to keep alternating between the one-column and multi-column layouts (i.e. using Section breaks to switch back & forth).

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]