I want to make a mood ring that listens to words you say in open chat. For example, when the wearer says "I'm happy to see you!" I want the ring to turn blue because it heard the wearer say "happy." The problem I'm having is coming up with a system where there are several lists with several key words (Happy: happy, smiles, laughs / Sad: sad, frowns, cries / etc.). I know I need to use llSubStringIndex, but I honestly have no idea how it works. Can anyone help me please?