Psalms 15-19

I think I have discovered a pattern - Psalm 17 may be the centre of 15-19; 15-16 share vocabulary and match the pattern of Torah then Messianic, 18 and 19 are Messianic and Torah related - 17 is in the middle and it is not well understood according to at least one commentator - let's see what poetic structure will make of it (eventually).