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tasks/21.md

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###
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<img src="./art/21.png" alt="solution" >
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#### eng:
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#### рус:
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#### код с коментариями:
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```sql
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```
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#### код для hackerrank:
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```sql
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```
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#### На [главную](https://github.com/BEPb/hackerrank_sql#readme)
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tasks/22.md

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###
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<img src="./art/22.png" alt="solution" >
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#### eng:
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#### рус:
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#### код с коментариями:
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```sql
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```
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#### код для hackerrank:
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```sql
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```
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#### На [главную](https://github.com/BEPb/hackerrank_sql#readme)
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tasks/23.md

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###
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<img src="./art/23.png" alt="solution" >
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#### eng:
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#### рус:
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#### код с коментариями:
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```sql
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```
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#### код для hackerrank:
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```sql
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```
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#### На [главную](https://github.com/BEPb/hackerrank_sql#readme)
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tasks/24.md

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###
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<img src="./art/24.png" alt="solution" >
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#### eng:
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#### рус:
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#### код с коментариями:
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```sql
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```
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#### код для hackerrank:
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```sql
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```
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#### На [главную](https://github.com/BEPb/hackerrank_sql#readme)
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tasks/25.md

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###
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<img src="./art/25.png" alt="solution" >
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#### eng:
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#### рус:
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#### код с коментариями:
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```sql
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```
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#### код для hackerrank:
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```sql
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```
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#### На [главную](https://github.com/BEPb/hackerrank_sql#readme)
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tasks/26.md

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###
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<img src="./art/26.png" alt="solution" >
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#### eng:
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#### рус:
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#### код с коментариями:
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```sql
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```
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#### код для hackerrank:
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```sql
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```
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#### На [главную](https://github.com/BEPb/hackerrank_sql#readme)
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tasks/27.md

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###
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<img src="./art/27.png" alt="solution" >
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#### eng:
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#### рус:
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#### код с коментариями:
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```sql
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```
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#### код для hackerrank:
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```sql
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```
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#### На [главную](https://github.com/BEPb/hackerrank_sql#readme)
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tasks/28.md

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###
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<img src="./art/28.png" alt="solution" >
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#### eng:
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#### рус:
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#### код с коментариями:
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```sql
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```
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#### код для hackerrank:
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```sql
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```
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#### На [главную](https://github.com/BEPb/hackerrank_sql#readme)
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tasks/29.md

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###
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<img src="./art/29.png" alt="solution" >
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#### eng:
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#### рус:
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#### код с коментариями:
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```sql
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```
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#### код для hackerrank:
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```sql
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```
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#### На [главную](https://github.com/BEPb/hackerrank_sql#readme)
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tasks/30.md

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###
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<img src="./art/30.png" alt="solution" >
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#### eng:
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#### рус:
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#### код с коментариями:
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```sql
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```
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#### код для hackerrank:
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```sql
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```
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#### На [главную](https://github.com/BEPb/hackerrank_sql#readme)
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---

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