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熟練 じゅくれんしてはならない
jukuren shitewa naranai

敬
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i-Adjective
, 
Pre-noun Modifier

Formal prohibition of 熟練した

1. Must not become skilled.; Do not practice.; Do not master.

Polite
, 
Formal Register
, 
Prohibition

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熟練してはならない

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