[plt-scheme] i need help

im trying to configure constants(strucuts) that have other constants in theyre parameters and vice versa

 

for example

(define neamt(make-city 'neamt 234 (list(list lasi 87))))
(define lasi(make-city 'lasi 226 (list(list vaslui 92)(list neamt 87))))

 

i get error for the first decleration that lasi is not defined

 

what to do? please help me
 		 	   		  
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