One explains why things did not work out as planned.
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To solve their problems, one will need discipline and continuity.
In the making
Solving a difficulty requires a patient study. If one fails, one will receive help after showing that one has done one's best.
Proof (Pivot's method)
Something useful can be obtained, the most experienced will be able to succeed, another will be likely to damage it.
One warns those who seek to stand out.