OpenCyber AcademyLesson map
Lesson 18. Map, example, EX064.
flowchart TD
M["May restore cell is 0"] --> C["Prose: nobody knew how"]
J["June restore cell is 1"] --> T["Prose: a test folder"]
T --> Q{"Does the 1 name patient letters?"}
Q -->|No| K["May's zero stays"]
Practice changes a later cell. It does not edit the earlier zero.
Logical drawing
restore index: 2
May 0, June 1, July 1
object restored in prose: a test folder
not the object: patient-letters/ or old-backup.zip
Learning outcomes
After this chapter, you should be able to:
- Keep May's restore zero.
- Bound June's one to a test folder in prose.
- Refuse a letter restore and a zip deletion dressed up as the same event.
18.1 Index 2 flips. The letters are a different object.
The restore task is index 2. May stores 0. The prose says the miss happened because nobody knew how. June stores 1 after Leila practised with a test folder. July stores 1. The script's miss line for May names "check backups restored" and the June line does not. Nothing in the cell identifies the folder, the file, or a byte count.
patient-letters/ is a sharing triple, not a restore operand. old-backup.zip is the archive that was later deleted. Deleting an unneeded zip does not exercise a restore, and a test-folder practice does not show that the letters could be returned. The two labs do not share a row identifier, so a reader cannot join them by key.
A successful June practice leaves May's zero where it is. Rewriting May to 1 would raise May's numerator and shorten its miss list. That rewrite is not in the file. No backup product, no location, and no duration are printed.
18.2 Worked example
Lesson table; scroll horizontally to read all columns →
| Claim | Fit | Decision |
|---|---|---|
| May missed the restore task | Index 2 is 0 | Keep |
| June's practice used a test folder | Prose | Keep, unnamed beyond that |
| "Patient letters were restored in June." | No such operand | Reject |
| "May was corrected to 1 after the practice." | The vector is unchanged | Reject |
Synthetic case. The test folder has no further name.
Errors and limits
Do not join the zip's deletion to index 2. They answer different questions.
Apply
- EX064 — Which object. A note changes May's restore bit to 1, says the patient letters were restored, and treats the zip deletion as that restore. What stays in the file?
Show marking criteria
Rubric: 3 = May stays 0 and June stays 1 at index 2; the practice object stays an unnamed test folder; letters and the zip are different objects; do not edit the vector;; 2 = the bits stay and the letters claim is refused;; 1 = one bit;; 0 = none.