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We show that a set of different homographies can be embedded in different ways to a higher-dimensional real or complex space , so that each homography corresponds to either a complex bilinear form or a real quadratic form .
 higher-dimensional real or complex space, homographies; complex bilinear form, homography; complex bilinear form, real quadratic form; real quadratic form, homography
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 higher-dimensional real or complex space, homographies; complex bilinear form, homography; complex bilinear form, real quadratic form; real quadratic form, homography