diff --git a/README.md b/README.md
deleted file mode 100644
index 600901c..0000000
--- a/README.md
+++ /dev/null
@@ -1,4 +0,0 @@
-# toolkit
-My most frequently used tools in programming
-
-- [Plural](/plural) (TS, PHP)
diff --git a/plural/README.md b/plural/README.md
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--- a/plural/README.md
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-# Функция изменения формы слов в зависимости от числительного
-
-Часто встречается задача вывода правильного окончания слова с предшествующим ему числом. 
-
-Например:
-
-- 1 депутат
-- 2–4 депутат**а**
-- 0, 5-9 или 10 депутат**ов**
-
-## Примеры исользования
-
-### Typescript
-```typescript
-import { plural } from 'plural';
-
-const totalOrders = 2;
-
-const words = ['заказ', 'заказа', 'заказов'];
-
-const result = `${totalOrders} ${plural(totalOrders, words)}`;
-
-console.log(result); // 2 заказа
-```
-
-### PHP
-```php
-include 'plural.php';
-
-$totalOrders = 2;
-
-$words = ['заказ', 'заказа', 'заказов'];
-
-$result = "{$totalOrders} {plural($totalOrders, $words)}";
-
-echo result; // 2 заказа
-```
diff --git a/plural/php/index.php b/plural/php/index.php
deleted file mode 100644
index 77dafea..0000000
--- a/plural/php/index.php
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@@ -1,9 +0,0 @@
-<?php
-
-function plural(int $count, array $words)
-{
-  $cases = [2, 0, 1, 1, 1, 2];
-  return $words[
-    $count % 100 > 4 && $count % 100 < 20 ? 2 : $cases[min($count % 10, 5)]
-  ];
-}
\ No newline at end of file
diff --git a/plural/typescript/index.ts b/plural/typescript/index.ts
deleted file mode 100644
index c5c207f..0000000
--- a/plural/typescript/index.ts
+++ /dev/null
@@ -1,8 +0,0 @@
-export type WordForms = [string, string, string];
-
-export const plural = (count: number, words: WordForms): string => {
-    const cases = [2, 0, 1, 1, 1, 2];
-    return words[
-      count % 100 > 4 && count % 100 < 20 ? 2 : cases[Math.min(count % 10, 5)]
-    ];
-  };
\ No newline at end of file
diff --git a/type-challenges/ip.ts b/type-challenges/ip.ts
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--- a/type-challenges/ip.ts
+++ /dev/null
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-type Split<S extends string, D extends string> = S extends ''
-  ? []
-  : S extends `${infer T}${D}${infer U}`
-    ? [T, ...Split<U, D>]
-    : [S];
-
-type UnwrapNumbers<T extends string | string[] | number | number[]> = T extends number | number[]
-  ? T
-  : T extends string
-    ? T extends `${infer N extends number}`
-      ? N
-      : never
-    : T extends [infer H extends string, ...infer T extends string[]]
-      ? UnwrapNumbers<H> extends never
-        ? never
-        : [UnwrapNumbers<H>, ...UnwrapNumbers<T>]
-      : [];
-
-type IPv4Octets = [number, number, number, number];
-type IPv6Octets = string[];
-
-type IPv4<CIDR extends string> = Split<CIDR, '/'> extends [
-  infer IP extends string,
-  infer SUBNET extends string,
-]
-  ? UnwrapNumbers<Split<IP, '.'>> extends infer OCTETS
-    ? OCTETS extends never
-      ? never
-      : OCTETS extends IPv4Octets
-        ? UnwrapNumbers<SUBNET> extends never
-          ? never
-          : CIDR
-        : never
-    : never
-  : never;
-
-type IPv6<CIDR extends string> = Split<CIDR, '/'> extends [
-  infer IP extends string,
-  infer SUBNET extends string,
-]
-  ? Split<IP, ':'> extends IPv6Octets
-    ? UnwrapNumbers<SUBNET> extends never
-      ? never
-      : CIDR
-    : never
-  : never;
-
-type Test_1 = IPv4<'0.0.0.0/0'>;
-type Test_2 = IPv4<'255.255.255.255/32'>;
-type Test_3 = IPv4<'127.0.0.0.1/32'>;
-type Test_4 = IPv4<'a'>;
-type Test_5 = IPv4<'1.1.1.a/32'>;
-type Test_6 = IPv4<'1.1.1.1'>;
-type Test_7 = IPv4<'1.1.1.1/'>;
-type Test_8 = IPv4<'1.1.1.1/a'>;
-
-type Test_9 = IPv6<'::1/0'>;
-type Test_10 = IPv6<'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128'>;
-type Test_11 = IPv6<'::1/128'>;
-type Test_12 = IPv6<'a'>;
-type Test_13 = IPv6<'1:1:1:1:1:1:1:1/128'>;
-type Test_14 = IPv6<'1:1:1:1:1:1:1:1'>;
-type Test_15 = IPv6<'1:1:1:1:1:1:1:1/'>;
-type Test_16 = IPv6<'1:1:1:1:1:1:1:1/a'>;
-
-// TODO: fully-typed ipv6 (unwrap hex, full and abbreviated address representations)