What Are SubTiers?
In Semantic Mastery's weekly Hump Day Hangouts episode 288, one viewer asked what subtiers are.
The exact question was:
1) I understand tiers but What is tier 3.a, 3.b, 4.a, 4.b etc.? Why there is sub tiers?

In Semantic Mastery's weekly Hump Day Hangouts episode 288, one viewer asked what subtiers are.
The exact question was:
1) I understand tiers but What is tier 3.a, 3.b, 4.a, 4.b etc.? Why there is sub tiers?
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