texmath-0.9.4: tests/writers/munderover-07.eqn
{BASE from under-1 to over-2} from under-2 to over-1 = {{BASE to over-2} from under-1} from under-2 to over-1
{BASE from under-1 to over-2} from under-2 to over-1 = {{BASE to over-2} from under-1} from under-2 to over-1