diff --git a/candidates.py b/candidates.py
new file mode 100644
index 0000000..7603240
--- /dev/null
+++ b/candidates.py
@@ -0,0 +1,18 @@
+import itertools
+import re
+
+from dictionary import Dictionary
+
+
+def candidates(letters, dictionary: Dictionary, excludes, min=2):
+    possibilities = []
+    for length in range(min, len(letters) + 1):
+        for comb in itertools.combinations(letters, length):
+            for perm in itertools.permutations(comb):
+                word = "".join(perm)
+                possibilities.append(word)
+    return dictionary.filter(possibilities, excludes)
+
+
+def filter_possibilities(possibilities, regex):
+    return set(filter(regex.match, possibilities))
diff --git a/main.py b/main.py
index 123f1cd..8aed775 100755
--- a/main.py
+++ b/main.py
@@ -1,8 +1,13 @@
 import argparse
 from string import ascii_lowercase
 import cmd2
+import re
+import os
 
+from candidates import candidates, filter_possibilities
 from dictionary import DEFAULT, ALTERNATE
+from word_remove_dialog import RemoveWordsActivity
+
 
 LOWERCASE = set(ascii_lowercase)
 DICTS = {"default": DEFAULT, "alt": ALTERNATE}
@@ -15,7 +20,10 @@ commands.add_argument(
 commands.add_argument("-s", "--switch", help="Dictionary to swap to")
 
 letter_set_manage = argparse.ArgumentParser()
-letter_set_manage.add_argument("new_letters")
+letter_set_manage.add_argument("letter", nargs="+")
+
+guessing = argparse.ArgumentParser()
+guessing.add_argument("pattern", help="Pattern to match")
 
 
 class MainLoop(cmd2.Cmd):
@@ -23,14 +31,22 @@ class MainLoop(cmd2.Cmd):
 
     """
 
-    prompt = "?$ "
+    prompt = "<{}> $ "
 
     def __init__(self):
         self.dict = "default"
-        self.letters = [l for l in input("Enter letters: ").lower() if l in LOWERCASE]
-        self.prompt = ", ".join(self.letters) + " " + MainLoop.prompt
+        self.excludes = set()
+        self.init_letters(input("Enter letters: "))
         super().__init__()
 
+    def init_letters(self, letters):
+        if not isinstance(letters, str):
+            letters = "".join(letters)
+        letters = letters.lower()
+        self.letters = [l for l in letters if l in LOWERCASE]
+        self.prompt = MainLoop.prompt.format(", ".join(self.letters))
+        self.candidates = candidates(self.letters, DICTS[self.dict], self.excludes)
+
     @cmd2.with_argparser(dictionary_manage_parser)
     def do_dict(self, args):
         """list/switch dict"""
@@ -49,7 +65,22 @@ class MainLoop(cmd2.Cmd):
 
     @cmd2.with_argparser(letter_set_manage)
     def do_change_letters(self, args):
-        pass
+        """Change the letters on the board"""
+        self.init_letters(args.letter)
+
+    @cmd2.with_argparser(guessing)
+    def do_find(self, args):
+        """Find words that match a pattern"""
+        pattern = re.compile(args.pattern + "$")
+        matching_words = filter_possibilities(self.candidates, pattern)
+        app = RemoveWordsActivity(matching_words, self.excludes)
+        if os.name == "nt":
+            app.run(fork=False)
+        else:
+            app.run()
+        was_canceled, new_exludes = app.get_results()
+        if not was_canceled:
+            self.excludes.update(new_exludes)
 
 
 if __name__ == "__main__":
diff --git a/word_remove_dialog.py b/word_remove_dialog.py
index 647a7f1..737da1f 100644
--- a/word_remove_dialog.py
+++ b/word_remove_dialog.py
@@ -32,7 +32,10 @@ class AddRemoveForm(npyscreen.ActionFormV2):
             max_height=10,
         )
         self.to_remove = self.add(
-            BoxedRemovableMulti, values=[], name="Words to remove", max_height=10
+            BoxedRemovableMulti,
+            values=sorted(self.parentApp.starting_excludes),
+            name="Words to remove",
+            max_height=10,
         )
         self.keepers.entry_widget.register_oppisite(self.to_remove.entry_widget)
 
@@ -47,9 +50,10 @@ class AddRemoveForm(npyscreen.ActionFormV2):
 
 
 class RemoveWordsActivity(npyscreen.NPSAppManaged):
-    def __init__(self, starting_values, *args, **kwargs):
+    def __init__(self, words, excludes, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        self.starting_values = starting_values
+        self.starting_values = words
+        self.starting_excludes = excludes
 
     def onStart(self):
         self.addForm(