The following example uses both single notes and chords. It also features a technique known as double tonguing. Double tonguing means playing each group of two notes with a "ta ka" sound. The first note is articulated with the front of the tongue (ta) and the second note is articulated with the back of the tongue. Try saying taka taka taka taka several times before playing the following example.
Here is a variation on the previous rhythm part. These kind of harmonica parts are often called "train rhythms". Practice each one slowly until you have it memorized and then gradually build up the speed.