1.2 ! paf 1: $t[^table::create{a b ! 2: 1 2 ! 3: 1 3 ! 4: }] ! 5: #^t.hash[a] ! 6: #^t.hash[a;b] ! 7: $d[^t.hash[a][$.distinct(1)]] ! 8: ^d._count[]