So let's suppose we're working with three hexane. Now three hexane has two types of isomers. It has the trans three hexen isomer or the e three hexenisomer. And there's also the S three hexenisomer or the Z three hexane isomer. Now, trans simply means the smaller H groups are on opposite sides of the double bond, while the E means that the two higher priority groups are in opposite sides of our double bond. Likewise, sin simply means that the two H groups are on the same side of the double bond, while the Z means that the two priority, the higher priority groups are the same side of the double bond.