В алфавите 30 символов, каким минимальным кол-вом бит можно закодировать каждый символ из этого алфавита

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вставьте in, from, of ,about, for ,with в следующее письмо dear mary
thank you for your letter.
it was so nice to hear ...  you! I would like to tell you ...  my weekend. Last Sunday I went to visit ... my grandma ... my parents. We missed ... her very much. She lives ... the country in her own house.
She was very glad to see us. I took a lot ... pictures ... my family and ... myself .    ... the evening we made a fire and sang old Russian songs. When you come here ... next time we,ll visit ... my grandma ... you. Please write me ... your weekend.
Best wishes   ...  us all.