First version of explain. Creating a new parser was a wrong approach. Need to reimplement

_concepts.txt

@@ -69,7 +69,10 @@ def concept ninety as 90
 ninety isa number
 def concept nineties from bnf ninety number where number < 10 as ninety + number
 nineties isa number
-#def concept hundreds from number1 hundred and number2 where number1 < 10 and number2 < 100 as number1 * 100 + number2
-#def concept one hundred as 100
-#one hundred isa number
-#hundreds isa number
+def concept hundreds1 from number hundred where number1 < 10 as number1 * 100
+def concept hundreds2 from number1 hundred and number2 where number1 < 10 and number2 < 100 as number1 * 100 + number2
+def concept one hundred as 100
+one hundred isa number
+hundreds1 isa number
+hundreds2 isa number
+def concept history as history()