MILLIONS
[
VLIB_NATURAL_NUMBER_ROUND_MILLIONS:z {<choice $z>}
]


VLIB_NATURAL_NUMBER_ROUND_MILLIONS [
  [ none zero ] {return("0")}

  ( a million ) {return("1000000")}
  ( VSUB_NATURAL_MILLIONS_THRU_999:m ?million ) {return(strcat($m "000000"))}
 
  ; six fifty three (without the word "million")
  ( VSUB_DIGIT_ONE_THRU_NINE:h VSUB_NATURAL_MILLIONS_THRU_99:u
  ) {return(strcat(strcat($h $u) "000000"))}
]

VSUB_NATURAL_MILLIONS_THRU_999 [
  ( VSUB_NATURAL_MILLIONS_THRU_99:n ) {return($n)}
  ( a hundred ?and VSUB_NATURAL_MILLIONS_THRU_99:u  ) {return(add(100 $u))}
  ( VSUB_DIGIT_ONE_THRU_NINE:h hundred ?and VSUB_NATURAL_MILLIONS_THRU_99:u
  ) {return(add(mul(100 $h) $u))}
]

VSUB_NATURAL_MILLIONS_THRU_99 [
  VSUB_DIGIT_ONE_THRU_NINE:n {return($n)}
  ten {return(10)}
  VSUB_TEEN:t {return($t)}
  VSUB_DECADE:t {return($t)}
  ( VSUB_DECADE:t VSUB_DIGIT_ONE_THRU_NINE:u ) {return(add($t $u))}
]

VSUB_DIGIT_TWO_THRU_NINE [
  two {return(2)}
  three {return(3)}
  four {return(4)}
  five {return(5)}
  six {return(6)}
  seven {return(7)}
  eight {return(8)}
  nine {return(9)}
]

VSUB_DIGIT_ONE_THRU_NINE[
  one {return(1)}
  VSUB_DIGIT_TWO_THRU_NINE:n {return($n)}
]

VSUB_DIGIT [
  [ zero oh ] {return(0)}
  VSUB_DIGIT_ONE_THRU_NINE:n {return($n)}
]



VSUB_DIGIT_TWO_THRU_NINE_STRING [
  two {return("2")}
  three {return("3")}
  four {return("4")}
  five {return("5")}
  six {return("6")}
  seven {return("7")}
  eight {return("8")}
  nine {return("9")}
]

VSUB_DIGIT_ONE_THRU_NINE_STRING [
  one {return("1")}
  VSUB_DIGIT_TWO_THRU_NINE_STRING:n {return($n)}
]

VSUB_DIGIT_STRING [
  [ zero oh ] {return("0")}
  VSUB_DIGIT_ONE_THRU_NINE_STRING:n {return($n)}
]

VSUB_TEEN_STRING [
  eleven {return("11")}
  twelve {return("12")}
  thirteen {return("13")}
  fourteen {return("14")}
  fifteen {return("15")}
  sixteen {return("16")}
  seventeen {return("17")}
  eighteen {return("18")}
  nineteen {return("19")}
]

VSUB_DECADE_STRING [
  twenty {return("2")}
  thirty {return("3")}
  forty {return("4")}
  fifty {return("5")}
  sixty {return("6")}
  seventy {return("7")}
  eighty {return("8")}
  ninety {return("9")}
]

VSUB_TEEN [
  eleven {return(11)}
  twelve {return(12)}
  thirteen {return(13)}
  fourteen {return(14)}
  fifteen {return(15)}
  sixteen {return(16)}
  seventeen {return(17)}
  eighteen {return(18)}
  nineteen {return(19)}
]

VSUB_DECADE [
  twenty {return(20)}
  thirty {return(30)}
  forty {return(40)}
  fifty {return(50)}
  sixty {return(60)}
  seventy {return(70)}
  eighty {return(80)}
  ninety {return(90)}
]