Http Khartoumspace Uofk Edu Bitstream Handle 123456789 25267 Principles 20of 20education 20in 20al Khalwa 20and 20its 20development 20to 20quran 20schools 20as 20an 20experiment 20for 20re Originality 20of 20education 20in 20republic 20of 20sudan Pdf Sequence 1 Isallowed Y