One experiments with a new method that will correct the defects that are currently observed.
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One goes on their own if necessary. Stick to the essential.
In the making
Renewal is necessary when deficiencies are identified and one has a substitution plan. It will be in their interest to complete the changes. One should forget regrets.
Proof (Pivot's method)
When one encounters difficulties, one welcomes the weakest to secure their future.
One wants to improve because of the weakness.