ftp://ftp.qucis.queensu.ca/pub/txl/Archive/7.4/TXL7.4/examples/  direct

[DIR]tricks/  direct  23 twin directories
[DIR]software-eng/  direct  75 twin directories
[DIR]optimization/  direct  265+ twin directories
[DIR]languages/  direct  5455+ twin directories
[DIR]general/  direct  3930+ twin directories