Browse the implementors of #beVariable message and you will find other filters under BPatternVariableNode class, such as #beInstVar or #beLocalVar. If you miss something, just add a method. No new syntax required.
Maggie 姐叱咤夜场25年，看遍风云变幻、人生百态，她对自己的事业仍抱有热忱（图：南方人物周刊记者 方迎忠）
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One study often cited is by Canadian psychologists Donald Dutton and Susan Painter. In research published in 1993 while they were at the University of British Columbia, they followed 75 women after they had left abusive partners.
V3.0 — Hooks, Crooks, and Nooks
Cross-privilege return path