As an aside, here is the full 36 GCDs in number form, 1 is buff, 2 is spend:
111
222
122
212
121
222
112
222
121
212
122
222
I have similarly highlighted the differentGCD strings that appear more than once. In total, of the 8 possible permutations, only 6 different ones are actually used, missing 211 and 221. This doesn't mean they will never be used as the PB windows can scramble this as I have previously mentioned, which again highlights the importance of adapting to the situation rather than just following a static GCD loop.