I am writing a soduku solver.. Everything works but since i am interested 
in first solution.. when i write `first` after 
https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L58

I get 

{:type java.lang.IllegalArgumentException 
;; :message "Don't know how to create ISeq from: java.lang.Long" 
;; :at [clojure.lang.RT seqFrom "RT.java" 542]}

though printing the argument gives me..
    ; "value: " () " class: " clojure.lang.LazySeq

at 
https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L786

Please see full stack trace at : 
https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L88

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