def is_BASE(U, UISC, UGC):
	return (UISC in [Number, Consonant, Consonant_Head_Letter,
			#SPEC-DRAFT Consonant_Placeholder,
			Tone_Letter,
			Vowel_Independent #SPEC-DRAFT
			] or
		(UGC == Lo and UISC in [Avagraha, Bindu, Consonant_Final, Consonant_Medial,
					Consonant_Subjoined, Vowel, Vowel_Dependent]))