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+# Author: Robert DiCicco
+# Date:   21-FEB-2022
+# Challenge #153 Left Factorials ( Tcl )
+
+proc Factorial {x} {
+   set i 1; set product 1
+   while {$i <= $x} {
+      set product [expr $product * $i]
+      incr i
+   }
+
+   return $product
+}
+
+set Total 0
+set I 0
+
+while { $I < 10 } {
+  set X [Factorial $I]
+  set Total [expr $X + $Total]
+  puts -nonewline $Total
+  puts -nonewline " "
+  incr I
+}