val .isCusip = f(.s) {
    if not isString(.s) or len(.s) != 9 {
        return false
    }

    val .basechars = cp2s('0'..'9') ~ cp2s('A'..'Z') ~ "*@#"

    val .sum = for[=0] .i of 8 {
        var .v = index(s2s(.s, .i), .basechars)
        if not .v: return false
        .v = .v[1]-1
        if .i div 2: .v x= 2
        _for += .v \ 10 + .v rem 10
    }

    .s[9]-'0' == (10-(.sum rem 10)) rem 10
}

val .candidates = w/037833100 17275R102 38259P508 594918104 68389X106 68389X105/

for .c in .candidates {
    writeln .c, ": ", if(.isCusip(.c): "good" ; "bad")
}