L-System certificate

Criss Evans

passed the exam of the course English: Phrasal Verbsdemo course

The course was a demo course — short, built to show the format. The examination was the ordinary one, and this certificate is valid.

5 of 5 correct — 100% against a pass mark of 60%

What this document attests

This exam was taken in a browser on the L-System server, past the AI assistant: the questions are not passed through the connector and do not leave the server.

Signed: the holder’s name, the certificate code, the course, its major version, the result and the date of issue. They cannot be changed without breaking the signature.

What it does not

The holder’s identity. The name is the one given at registration, and we do not check it against any document.

What was examined

3 units, a bank of 75 questions · ~1.5 h
major version of the course: 1 — a newer version does not cancel it
issued: 20 August 2026

How it was examined

an exam of 5 questions, drawn at random
45 s per question, timed by the server

Certificate code

This page is the check itself: the code is part of its address — lsystem.vercel.app/certificates/91BWJG51YFRC7HBX

Printable sheet PDF Image

The sheet is a copy for printing. Whether the certificate is valid right now is answered by this page, not by the printout.

The signature matched when this page opened, 2026-08-31 22:27 UTC.

Not revoked as of 31 August 2026.

Issued by lsystem.vercel.app. Questions about this document: andreykuralekh@gmail.com

Course: English: Phrasal Verbs