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 numbers
def one isa number
def two isa number
def three isa number
def four isa number
def five isa number
def six isa number
def seven isa number
def eight isa number
def nine isa number
def ten isa number
def eleven isa number
def twelve isa number
def thirteen isa number
def fourteen isa number
def fifteen isa number
def sixteen isa number
def seventeen isa number
def eighteen isa number
def nineteen isa number
def twenty isa number