Hello! I am discussing with a colleague which of the following two phrases is most accurate: 1. "Services of an experienced, professional tour manager for the duration of the tour." 2. "Services of an experienced professional tour manager for the duration of the tour." The only difference between the two sentences that sentence #1 has a comma between experienced and professional. I am trying to explain how the comma changes the meaning. It seems to me that in sentence #1 "experienced" and "professional" are both adjectives modifying "tour manager" whereas in sentence #2 there is only one adjective "experienced" and it is modifying "professional tour manager." Am I on the right track?