81 Usul literally means

Root

82 Faru literally means

Branches

83 The writer of Al Usul was

Fakhrul Islam Bazdawi

84 Taudih is written by

Sadrush Shariat

85 Talwih is written by

Taftazani

86 Jamul Jawami was written by

Tajuddina Subuki

87 Mukhtasar was written by

Ibn Hajib

88 At Taqrir Wat Tahbir was written by

Ibn Hammam

89 Fiqh literally means

Knowledge

90 Usulul Fiqh means

Ilmul Usul