Talvez deva tentar algumas variações de ortografia:
code permutation » the permutation (Expandir a busca), idle permutation (Expandir a busca), of permutation (Expandir a busca)
permutation rate » permeation rate (Expandir a busca), permutation based (Expandir a busca), fermentation rate (Expandir a busca)
rate decrease » rats decreases (Expandir a busca), ratio decrease (Expandir a busca), rate increase (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
code code » code cdc (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( code code permutation rate decrease ) OR ( _ python python python programming ))~.