Question: After 1991, what BMW concept vehicle models were created?
Answers:
answer_text: Nazca C2  
answer_text: Nazca C2 Spider  
answer_text: Z9  
answer_text: Z9 Convertible  
answer_text: X-Coupé  
answer_text: CS1  
answer_text: Concept Z4 Coupé  
answer_text: Concept Coupé Mille Miglia  
answer_text: 1 Series tii  
answer_text: Concept X1  
answer_text: C1-E  
answer_text: Vision ConnectedDrive  
answer_text: i3 Concept Coupé  
answer_text: BMW Concept Active Tourer Outdoor  
answer_text: M4 Concept Iconic Lights  
answer_text: Concept 8 Series  
answer_text: Concept M8 Gran Coupé  
answer_text: Concept i4 [https://www.heise.de/hintergrund/BMW-i4-mit-Intelligenzflaeche-4673393.html heise.de  3 March 2020, Elektroauto: BMW i4 mit "Intelligenzfläche" ] (German), retrieved 2020-03-08.