library /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;

static method main() → void {
  core::print(core::List::generate<core::List<core::int>>(10, (core::int i) → core::List<core::int> => core::List::generate<core::int>(i, (core::int i) → core::int => i.{core::num::+}(1){(core::num) → core::int})));
}