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- (empty-FRAME)
- null
- (update)
- /\
- / \
- /\ \
- var val /\
- / \
- /\ \
- / \ \
- var val \
- \
- null
- (make-env)
- /\
- / \
- empty-FRAME null
- (extend-env)
- /\
- / \
- empty-FRAME \
- /\
- / \
- /\ null
- / \
- /\ \
- var val /\
- / \
- /\ \
- / \ \
- var val \
- \
- null
- (define-var)
- /\
- / \
- / \
- /\ \
- / \ \ current FRAME
- /\ \ \
- var val /\ \ <- defined var and val now
- / \ \
- /\ \ \
- / \ \ \
- var val \ \
- \ \
- null \
- \
- /\
- / \
- / \
- /\ \
- / \ \
- /\ \ \ older FRAME
- var val /\ \
- / \ \
- /\ \ \
- / \ \ \
- var val \ \
- \ \
- null \
- \
- /\
- / \
- / \
- /\ \ oldest FRAME
- / \ \
- /\ \ \
- var val /\ \
- / \ \
- /\ \ \
- / \ \ \
- var val \ \
- \ \
- null \
- null
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