please help me solve this

b) Suppose that we have 4 sources who participate in a synchronous TDM multiplexer and that combines only three characters from each user at a time. [Note that the characters are sent in the same order that they are typed. The first source is silent.] Draw the necessary frames with the appropriate contents using the Interleaving concept of TDM. a Source 1 message: b. Source 2 message: SUCHQUESTION c. Source 3 message: MUCHWOW d Source 4 message: DOGE