The term 'most certainly' can be expressed in a variety of ways. The six letter solution, 'INDEED, ' is a simple affirmation of agreement or confirmation. The three letter solution, 'YES, ' is another affirmative answer. The nine letter solution, 'yesindeed, ' is a combination of the two previous solutions and emphasizes the certainty of the statement. The twelve letter solution, 'beyondadoubt, ' implies that there is no doubt about the statement being made. The fifteen letter solution, 'assureasyoulive, ' suggests that the statement is as certain as life itself. Finally, the fifteen letter solution, 'youbetyourboots, ' implies that the statement is so certain that one would bet their boots on it.