Perhaps you should try some spelling variations:
period programming » end programming (Expand search), learning programming (Expand search)
pattern period » pattern error (Expand search)
based pattern » based battery (Expand search), based plasters (Expand search), mapped pattern (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
decrease its » decreases its (Expand search), decrease with (Expand search), decrease in (Expand search)
python based » action based (Expand search)
its process » its processes (Expand search), its processing (Expand search), its problems (Expand search)

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease AND decrease its process ) OR ( python based pattern period programming ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease and decrease its process ) OR ( python based pattern period programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease and decrease its process ) OR ( python based pattern period programming ))*.