are two basic types are two black are two blocks are two branches are two broad are two brothers are two categories are two challenges are two children are two classes are two common are two commonly are two complementary are two completely are two completely different are two concepts are two copies are two countries are two days are two different are two different kinds are two different people are two different things are two different ways are two distinct are two elements are two essential are two examples are two extremes are two faces are two factors are two famous are two full are two game are two good are two good reasons are two great are two groups are two holes are two identical are two important are two independent are two inseparable are two islands are two issues are two key are two kids are two kinds are two kinds of people are two large are two letters are two levels are two main are two main categories are two main forms are two main issues are two main reasons are two main sources are two main types are two main ways are two major are two men are two methods are two minutes are two modes are two more are two names are two national are two natural are two new are two numbers are two obvious are two of my favorite are two of them are two of us are two opposite are two options are two or more are two other are two parts are two peas are two people are two persons are two photos are two pictures are two points are two possibilities are two possible are two powerful are two primary are two reasons are two reasons why are two rows are two schools are two schools of thought are two separate are two separate things are two sets are two side