Visitors are shameful. GOST 30245-2003 - Profiles. GOST 8559-75 - Straw square! GOST 6688-91 - a straight corner! Specialists have divorced you. The damages, the fucker.
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You are of course right. But if you lose your order because of you, you will be fired and they will also be right. Because your job is not to teach the employer literacy, but to accept orders. And to help the customer to formulate what he needs, because they never, shit, do not know what they need!