Man is counting his newborns. If he mistakenly called the ninth 'Tenth', he called the tenth 'Ninth', and called the eleventh 'Tenth' what happens?
A Todah was slaughtered, intending to sanctify 80 breads how many are?
A man was Mekadesh a woman or her daughter, or 2 sisters, at the same moment is anyone married?
A man was Mekadesh his daughter to a man, without specifying which daughter - his Bogeres daughters are not even doubtfully Mekudashos.
If Reuven died, leaving 1 brother - he does Chalitzah to both women; if he left 2 what do we do?