== step =====
step =>> d3_X.prep   (*  :  *)
step =>> xc_X.prep   (*  :  *)
JOIN_test_step.J =>> test.step   (*  :  *)
JOIN_stepO.J =>> stepO   (*  :  *)
== upd =====
upd =>> test.upd   (*  :  *)
== ctor =====
ctor =>> test.ctor   (*  :  *)
== init =====
init =>> test.init   (*  :  *)
