Hexagramm gefällig?

From Author Wars - https://authorwars.com/books/hexagramm-gefallig-2192230.html

Overview:

Title: Hexagramm gefällig?
Author: Wilfried A. Hary
Year: 1977
Type: Short Fiction
Series: Mark Tate
Number in Series: 10

Variant Titles:

1977. Hexagramm gefällig?