A:()!() / aggregations

B:()!() / NYI: reserved for incremental update functions

C::.ht.visible[Q;G]I / visible columns

D:(::) / input -> output

E:(::) / event function

F:0#` / aggregated columns

G:0#` / grouping columns

H::.ht.groupable T / groupable columns

I::.ht.invisible[W;T;A;Q;F]G / invisible columns

J:([c:0#`]s:0#`;n:0#0;o:0#`) / rank table

K:(::) / sort vector

L:1b / show leaves?

M:(::) / NYI

N::count get T / row count

O.:(::) / properties

P:.ht.paths / paths

Q::.ht.qtype Z / types

R:`start`end!0 60 / rows

S:()!() / sort

T:`t / input table

U:0N / update?

V:(::) / view

W:.ht.state / pivot state

Y::G 0 / Y axis

X::$[count W 1;first 1_G except W[1;;1];G 1] / X axis

Z:`z / output table