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var xf = crossfilter();
var data = tributary.data;

xf.add(data);

console.log(xf);

var name = xf.dimension(function(d) { return d.name });
var food = xf.dimension(function(d) { return d.food });

var group = food.group().all()
console.log(group);

[
  {"name":"ian", "food":"chicken"},
  {"name":"dan", "food":"salad"},
  {"name":"dan", "food":"chicken"},
  {"name":"ian", "food":"salad"},
  {"name":"dan", "food":"chicken"},
  {"name":"ian", "food":"beef"},
  {"name":"dan", "food":"beef"},
  {"name":"ian", "food":"chicken"},
  {"name":"dan", "food":"salad"},
  {"name":"ian", "food":"chicken"},
  {"name":"ian", "food":"chicken"},
  {"name":"pam", "food":"chicken"},
  {"name":"pam", "food":"chicken"},
  {"name":"pam", "food":"chicken"},
  {"name":"pam", "food":"chicken"},
  {"name":"pam", "food":"chicken"}
]

{"description":"crossfilter interactive","endpoint":"","display":"div","public":true,"require":[{"name":"crossfilter","url":"http://square.github.io/crossfilter/crossfilter.v1.min.js"}],"fileconfigs":{"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"data.json":{"default":true,"vim":false,"emacs":false,"fontSize":12},"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12},"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12},"style.css":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"fullscreen":false,"play":false,"loop":false,"restart":false,"autoinit":true,"pause":true,"loop_type":"period","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01,"thumbnail":"http://i.imgur.com/2zBACel.png"}