well that specific cpu has 10 cores, 6p+ 4e, the p cores have 2 threads each totaling 16 threads, if you open windows task manager > performance > cpu > right click the big graph and change graph to > logical processors, you can see all 16, in task manager the last 4 are the E cores
the way the affinity mask works is reversed so in the first reply i gave core 0 is the last in that bitmask list, and core 15 the first one
Some tool like cpuid hwinfo can show all the cores/threads p/e core usage. Some tool like process lasso might also be useful if you only want to assign specific threads to an application.