def concept one as 1
def concept two as 2
def concept three as 3
def concept four as 4
def concept five as 5
def concept six as 6
def concept seven as 7
def concept eight as 8
def concept nine as 9
def concept ten as 10
def concept eleven as 11
def concept twelve as 12
def concept thirteen as 13
def concept fourteen as 14
def concept fifteen as 15
def concept sixteen as 16
def concept seventeen as 17
def concept eighteen as 18
def concept nineteen as 19
def concept twenty as 20
def concept number
one isa number
two isa number
three isa number
four isa number
five isa number
six isa number
seven isa number
eight isa number
nine isa number
ten isa number
eleven isa number
twelve isa number
thirteen isa number
fourteen isa number
fifteen isa number
sixteen isa number
seventeen isa number
eighteen isa number
nineteen isa number
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
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
def concept one hundred as 100
one hundred isa number
def concept hundreds from bnf number=n1 'hundred' 'and' number=n2 where n1 < 10 and n2 < 100 as n1 * 100 + n2
hundreds isa number
def concept hundreds from bnf number 'hundred' where number < 10 as number * 100
last_created_concept() is number
def concept thousands from bnf number 'thousand' where number < 1000 as number * 1000
thousands isa number
def concept thousands from bnf number=n1 'thousand' 'and' number=n2 as n1 * 1000 + n2 where n1 < 1000 and n2 < 1000
last_created_concept() is number
def concept history as history()
def concept plus from a plus b as a + b
def concept mult from a mult b as a * b