diff --git a/contacts/main.py b/contacts/main.py
deleted file mode 100644
index da21fd5..0000000
--- a/contacts/main.py
+++ /dev/null
@@ -1,188 +0,0 @@
-#!/usr/bin/env python3
-# -*- coding: utf-8 -*-
-
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-# IMPORTS
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-import os;
-import sys;
-import re;
-import numpy as np;
-from numpy import int32;
-import numpy.linalg as npLA;
-import pandas as pd;
-from typing import Dict;
-
-# erzwinge wd:
-SOURCEDIRECTORY = os.path.dirname(os.path.realpath(__file__));
-os.chdir(SOURCEDIRECTORY);
-
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-# GLOBAL VARIABLES
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-INPUT_CONTACTS = 'kontakte.csv';
-OUTPUT_GROUPS = 'teilnehmer.csv';
-OUTPUT_EMAILS = 'EMAILS';
-AUFGABEN: Dict[int, str] = dict();
-
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-# HAUPTVORGANG
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-def main():
-    contacts = get_contacts();
-    write_emails(contacts);
-    contacts = assign_groups(contacts);
-    contacts = assign_exercises(contacts);
-    contacts = censor_data(contacts);
-    write_groups(contacts);
-    print_groups(contacts);
-    return;
-
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-# SEKUNDÄRVORGÄNGE
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-def get_contacts() -> pd.DataFrame:
-    contacts = {};
-    lines = [];
-    with open(INPUT_CONTACTS, 'r') as fp:
-        lines = fp.readlines();
-    data = [];
-    for line in lines:
-        line = line.strip();
-        if line == '':
-            continue;
-        parts = line.split(r',');
-        for i, part in enumerate(parts):
-            parts[i] = part.strip();
-        for i in [0, 1]:
-            parts[i] = re.sub(r'_', r' ', parts[i]);
-        data.append(dict(
-            key=(parts[1] + ' ' + parts[0]).lower(),
-            surname=parts[0],
-            name=parts[1],
-            email=parts[2],
-            group=parts[3] if len(parts) >= 4 else None,
-            exercise=0
-        ));
-    contacts = pd.DataFrame(
-        data=data,
-        index=None,
-        columns=('key', 'surname', 'name', 'email', 'group', 'exercise')
-    );
-    contacts.group = pd.to_numeric(contacts.group, errors='coerce');
-    contacts = contacts.astype(dict(
-        key='string',
-        surname='string',
-        name='string',
-        email='string',
-        group='Int32',
-        exercise='string',
-    ));
-    del lines;
-    del data;
-    return contacts;
-
-def assign_groups(contacts: pd.DataFrame) -> pd.DataFrame:
-    index = 0;
-    lines = [];
-    with open('GROUPS', 'r') as fp:
-        lines = fp.readlines();
-    for line in lines:
-        line = line.strip();
-        if line == '':
-            continue;
-        index += 1;
-        pattern = [];
-        for word in line.split(r','):
-            key = word.strip().lower();
-            if key == '':
-                continue;
-            pattern.append(key);
-        pattern = re.compile('|'.join(pattern));
-        contacts.loc[contacts.key.str.contains(pattern), 'group'] = index;
-    return contacts;
-
-def assign_exercises(contacts: pd.DataFrame) -> pd.DataFrame:
-    global AUFGABEN;
-    lines = [];
-    with open('EXERCISES', 'r') as fp:
-        lines = fp.readlines();
-    for _, line in enumerate(lines):
-        g = _ + 1;
-        line = line.strip();
-        if line == '':
-            continue;
-        ex = line;
-        AUFGABEN[g] = ex;
-    contacts.exercise = contacts.group.apply(lambda g: AUFGABEN[g] if g in AUFGABEN else pd.NA);
-    return contacts;
-
-def censor_data(contacts: pd.DataFrame) -> pd.DataFrame:
-    contacts.email = contacts.email.apply(lambda i: re.sub(r'^(.*)(@.*)$', r'____\2', i));
-    return contacts;
-
-def write_emails(contacts: pd.DataFrame):
-    with open(OUTPUT_EMAILS, 'w') as fp:
-        line = ', '.join(list(contacts.email));
-        fp.write(line + ',\n');
-    return;
-
-def write_groups(contacts: pd.DataFrame):
-    contacts = contacts \
-        .sort_values(
-            by=['group', 'surname', 'name'],
-            ascending=[True, True, True],
-            na_position='last'
-        ) \
-        .reset_index(drop=True);
-    with open(OUTPUT_GROUPS, 'w') as fp:
-        fp.write('GRUPPE, AUFGABE, NACHNAME, VORNAME\n');
-        for _, entry in contacts.iterrows():
-            fp.write('{group}, {ex}, {surname}, {name}\n'.format(
-                surname=entry.surname.upper(),
-                name=entry['name'], # nötig, weil 'name' auch der Index ist
-                email=entry.email,
-                group=entry.group,
-                # group='' if pd.isnull(contacts.group[i]) else contacts.group[i],
-                ex=entry.exercise
-            ));
-    return;
-
-def print_groups(contacts: pd.DataFrame):
-    contacts = contacts \
-        .sort_values(
-            by=['group', 'name', 'surname'],
-            ascending=[True, True, True],
-            na_position='last'
-        ) \
-        .reset_index(drop=True);
-    n_groups = max([0] + [_ for _ in contacts.group if isinstance(_, int32)]);
-    for g in list(range(1, n_groups + 1)) + [0]:
-        if g == 0:
-            group = contacts[pd.isnull(contacts.group)].reset_index(drop=True);
-            print('- _keiner Gruppe zugeordnet!_', end='');
-        else:
-            group = contacts[contacts.group == g].reset_index(drop=True);
-            ex = AUFGABEN[g] if g in AUFGABEN else '???';
-            print('- **Gruppe {}** | {} |'.format(g, ex), end='');
-        Ng = len(group);
-        for _, entry in group.iterrows():
-            endchar = ',';
-            if _ == Ng - 1:
-                endchar = '\n';
-            print(' {name}.{surname}'.format(
-                surname=entry['surname'][0].upper(),
-                name=entry['name'][:3].upper(),
-            ), end=endchar);
-    return;
-
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-# AUSFÜHRUNG
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-if __name__ == '__main__':
-    main();