Fix wording and repeated inequalities; repair and execution-check the code choices in doc_ids 8 and 9. Preserve all 29 answer keys and the four existing removals.
This PR removes four LAMMPS/VASP questions with unresolved ambiguity in their wording or assumptions. The subset decreases from 33 to 29 questions: 16 LAMMPS and 13 VASP.
The removed items use the original zero-based doc_id values at base revision `26a914522944ab0fe5609019ce995bfb4d49bfa6`:
| Original doc_id | Question topic | Ambiguity motivating removal |
| --- | --- | --- |
| 1 | Flying ice cube effect | The stated observation does not uniquely identify the effect. |
| 19 | Methods available in vanilla VASP 6.x | The exact software release and scope of the build are unspecified. |
| 23 | Whether NPAR significantly affects results | The meaning of "significantly" and the relevant calculation conditions are unspecified. |
| 24 | KSPACING and the k-point count ratio | The mesh-counting convention and rounding rule need clarification. |
Only `lammps_vasp.csv` is changed. Every field, answer choice, answer key, and relative row order in the 29 retained records is preserved, with the s…
