1354044521
digits
234585432
digits
0
690000070
digits
catenate #(elem+list)
dup
reverse
0
1
    9
    copies
    9
    catenate #(list+elem)
t4
5
make-array
    unwords
    "9"
    diff #(list-list)
    show-line
m4
space
left-cons
select