create alias double_pregnant (0) -> taur_double_pregnancy (53)
create alias double_pregnancy (0) -> taur_double_pregnancy (53)
create implication taur_double_pregnancy (53) -> taur_upper_pregnancy (61)
create implication taur_double_pregnancy (53) -> taur_lower_pregnancy (199)
create alias impregnation_while_pregnant (7) -> stacked_impregnation (32)