diff --git a/src/main.py b/src/main.py
index 72c5aa7..85471a0 100644
--- a/src/main.py
+++ b/src/main.py
@@ -10,6 +10,7 @@ import time
 def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--stdin", default=False, action="store_true")
+   ap.add_argument("--stdout", default=False, action="store_true")
    ap.add_argument("--interval", default=250, type=int)
    ap.add_argument("--max-keys-down", default=2, type=int)
    ap.add_argument("--startup", default=3, type=int)
@@ -24,6 +25,8 @@ def main():
 
    w_translation = json.loads(args.translation) if args.translation else None
    w = writer.Writer(writer.PyAutoGUIWriter(w_translation))
+   if args.stdout:
+      w = writer.Writer(writer.StdoutWriter())
 
    if args.controller_setup:
       stdin = reader.StdinReader()
diff --git a/src/reader.py b/src/reader.py
index fd6ce3c..77cc5d1 100644
--- a/src/reader.py
+++ b/src/reader.py
@@ -69,16 +69,43 @@ class StdinReader:
 class RandomReader:
    def __init__(self, keys={"a":{"weight":1}, "b":{"weight":1}}):
       self.keys = keys
-      self.weighted_keys = []
-      for k in self.keys:
-         weight = int(self.keys[k]["weight"] * 1000)
-         self.weighted_keys.extend([k] * weight)
-      log.info("weighted keys", self.weighted_keys)
+      self.pool = RandomPool(keys)
 
    def read(self):
-      return self.weighted_keys[
-         random.randint(0, len(self.weighted_keys)-1)
-      ]
+      return self.pool.pop()
+
+class RandomPool:
+   def __init__(self, values):
+      self.values = {k:1000*v["weight"] for k,v in values.items()}
+      self.total = sum(self.values.values())
+      self.consumed = set()
+
+   def reset(self):
+      self.consumed = set()
+
+   def pop(self):
+      k = self._pop()
+      for i in range(0, 3-1):
+         if k in self.consumed:
+            k = self._pop()
+         else:
+            break
+      self.consumed.add(k)
+      if self.should_reset():
+         self.reset()
+      return k
+
+   def _pop(self):
+      idx = random.randint(0, self.total-1)
+      idx_offset = 0
+      for k in sorted(self.values.keys()):
+         if self.values[k] > idx+idx_offset:
+            return k
+         idx_offset -= self.values[k]
+      raise Exception(":(")
+
+   def should_reset(self):
+      return len(self.consumed) >= len(self.values)/2
 
 class FileReader:
    def __init__(self, path):