a=,four,fif,six,seven,eight,nine}
b={one,two,three${a/f,/ve,}
c=thir${a/t}t
eval "printf '%s
' zero {$b,ten,eleven,twelve,{$c\een,{twen,${c/u}y{,\ $b}} one\ hundred"
Note that non-ascii characters in the above source code will be escaped (such as \x9f).