]a=:d{~25+0 i.~({:e.[:,[:+/~}:)"1 (26,\d=:(".;._2)1!:1<'day09')  NB. 138879426
+/(<./,>./)(1=(/:~{.($#:I.@:,)a=-/~+/\d)I.i.#d)#d  NB. 23761694