
The complete proof:
The Isar proof is in: proofs/isar_proof14.thy
The proof in the natural language form is in: proofs/nl_proof14.tex
The number of steps: 4
The number of axioms used: 2
The list of used axioms:
ax_ncol_312 ax_ncol_213 

The clean proof: 
The Isar proof is in: proofs/isar_proof_optimized14.thy
The proof in the natural language form is in: proofs/nl_proof_optimized14.tex
The number of steps: 4

The list of all axioms considered (given and derived) is in: all_axioms.txt.

Basic time: 0.03 seconds. 
Cleaning time: 0.01 seconds. 
Total time: 0.04 seconds. 

