Related for Yevamot 74:1
הלכתא אהלכתא
between one <i>halachah</i> and the other. Said Abaye: Whence do I infer that R. Eliezer b. Jacob treats any doubtful case as a certainty? — [From] what was taught: R. Eliezer b. Jacob said, 'Behold, when a man has intercourse with many women and does not know with which particular woman<span class="x" onmousemove="('comment',' Among those who had issue from their unlawful connection. ');"><sup>1</sup></span>
Shulchan Arukh, Even HaEzer
One may not marry a woman who he intends to divorce. However, if he indicates to her in advance that he's marrying her for a fixed period of time, he is permitted to.
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