Concept validation must be requested

_concepts.txt

@@ -42,11 +42,30 @@ twenty isa number
 def concept twenties from bnf twenty number where number < 10 as twenty + number
 twenties isa number
 def concept thirty as 30
+thirty isa number
 def concept thirties from bnf thirty number where number < 10 as thirty + number
 thirties isa number
 def concept forty as 40
+forty isa number
 def concept forties from bnf forty number where number < 10 as forty + number
 forties isa number
 def concept fifty as 50
+fifty isa number
 def concept fifties from bnf fifty number where number < 10 as fifty + number
-fifties isa number
+fifties isa number
+def concept sixty as 60
+sixty isa number
+def concept sixties from bnf sixty number where number < 10 as sixty + number
+sixties isa number
+def concept seventy as 70
+seventy isa number
+def concept seventies from bnf seventy number where number < 10 as seventy + number
+seventies isa number
+def concept eighty as 80
+eighty isa number
+def concept eighties from bnf eighty number where number < 10 as eighty + number
+eighties isa number
+def concept ninety as 90
+ninety isa number
+def concept nineties from bnf ninety number where number < 10 as ninety + number
+nineties isa number