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- Syntax:
**do-ec**`?qualifier`...`command` Evaluate the

`command`exactly once for each binding in the sequence defined by the qualifiers. If there are no qualifiers`command`is evaluated exactly once. The expression is evaluated for its side–effects only. The result of the comprehension is unspecified.(let ((x 0)) (do-ec ;no qualifiers (set! x (+ x 1))) x) ⇒ 1 (let ((x 0)) (do-ec (:range i 10) ;i from 0 to 9 (set! x (+ x 1))) x) ⇒ 10 (let ((x 0)) (do-ec (:range i 0) ;loops zero times (set! x (+ x 1))) x) ⇒ 0 (let ((x 0)) (do-ec (:range n 10) ;n from 0 to 9 (:range k n) ;k from 0 to n (set! x (+ x 1))) x) ⇒ 45