LSt.30:19 :ܕܠܐ ܡܨܐ ܚܕ ܡܢܗܘܢ ܢܙܟܐ܂ ܐܠܘܠܐ ܗ݀ܘ ܐܚܪܢܐ ܢܬܚܝܒ‏ : for it is impossible for one of them to win unless the other should be defeated
See the entire entry for ˀe/illū conj. if only