Most Ashkenazim have the custom to fill a fifth cup at this point. This relates to a Talmudic discussion that concerns the number of cups that are supposed to be drunk. Given that the four cups are in reference to the four expressions of redemption in Exodus 6:6-7, some rabbis felt that it was important to include a fifth cup for the fifth expression of redemption in Exodus 6:8. All agreed that five cups should be poured but the question as to whether or not the fifth should be drunk, given that the fifth expression of redemption concerned being brought into the Land of Israel, which - by this stage - was no longer possessed of an autonomous Jewish community, remained insoluble. The rabbis determined that the matter should be left until Elijah (in reference to the notion that Elijah's arrival would precipitate the coming of the Messiah, at which time all halakhic questions will be resolved) and the fifth cup came to be known as the Kos shel Eliyahu ("Cup of Elijah"). Over time, people came to relate this cup to the notion that Elijah will visit each home on Seder night as a foreshadowing of his future arrival at the end of the days, when he will come to announce the coming of the Jewish Messiah. Some seders (including the original Women's Seder, but not limited to women-only seders) now set out a cup for the prophet Miriam as well as the traditional cup for the prophet Elijah, sometimes accompanied by a ritual to honor Miriam. Miriam's cup originated in the 1980s in a Boston Rosh Chodesh group; it was invented by Stephanie Loo, who filled it with mayim hayim (living waters) and used it in a feminist ceremony of guided meditation. Miriam's cup is linked to the midrash of Miriam's well, which "is a rabbinic legend that tells of a miraculous well that accompanied the Israelites during their 40 years in the desert at the Exodus from Egypt".