  In this paper, an extension of the classification of flipped SU(5)
heterotic-string vacua from [1] with a variation of the SO(10) breaking
$\alpha$ basis vector is presented. A statistical sampling in the space of
$2^{45}$ flipped SU(5) vacua is explored, where $10^{11}$ distinct GGSO
projection configurations are scanned in comparison to the $10^{12}$ GGSO
distinct coefficients scanned in the space of $2^{44}$ vacua in [1]. A JAVA
code, akin to the one used for the classification in [1], was implemented to
explore these. Results presented here indicate that no three generation
exophobic vacua exist, which was also found to be the case in [1] as all odd
generations were projected out. This paper will also study the details on the
comparison between the two classifications achieved and then reflect on future
directions in the quest for finding three generation exophobic flipped SU(5)
heterotic-string models.
