With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: San Diego city is in Southern California.
text_B: Alternation is a Patience game which is played using two decks of playing cards .. Patience. Patience ( game ). Its tableau -LRB- or playing area -RRB- is similar to that of another solitaire game , Stonewall .. tableau. Glossary of solitaire. Stonewall. Stonewall ( solitaire )
not_related.