Question about CRUSH rule set parameter "min_size" "max_size"

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Hi ,
      CRUSH map have two parameter are "min_size" and "max_size".
Explanation about min_size is "If a pool makes fewer replicas than this number, CRUSH will NOT select this rule".
The max_size is "If a pool makes more replicas than this number, CRUSH will NOT select this rule"

Default setting of pool replicate size is 1.
Created 2 rules that ruleset0 「min_size = 3」, ruleset1 「min_size = 1」and applied.
Then created a new pool named "test" and assume pool "test" will apply ruleset1.
But found pool "test" apply ruleset0.
Which part I missing?
Thanks a lot for any advice!

Best wishes,
​Mika
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