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(defun triangle (n)
(cond
( (floatp n) (print "Decimals number are not valid input, please enter an integer"))
( (stringp n) (print "Strings are not valid input, please enter an integer"))
)
(loop for i from 1 to n
do (loop for j from 1 to i
do (write j)
)
(princ #\NewLine)
)
)
(triangle 10)
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