key 4dKey interpolation Auto tangents A, T 1 Break tangents B, T 2 Zero angle (tangent) 0, T 3 Zero length (tangent) L, T 4 Clamp C, T 5 ar ALT + L, T 6 Step ALT + T, T 7 Soft ALT + S,Workbook answer keys and transcripts. 1. W. Workbook answer keys and transcripts. Introduction. IA Vocabulary. Holidays. Exercise 1 page 4. 1 statue 2 zoo 3