So it's a heptane and it's a four position substituted. So that means four chloroheptane, four chlorohessane. Okay, let's go to rule number three. In multisubstituted alkanes, substituents are ordered alphabetically, and identical substituents receive prefix, die, try, tetra, et cetera. So let's look at the last three examples. So once again, we have to keep these two rules in mind.