Page $2$:

$2$

$$

Page $3$:

$3$

$3$

$$

these are the categories in which we can classify key partners:

$$ strategic alliances, coopetition, join ventures, human resources

strategic alliances, coopetition, optimization $,$ and buyer $-$ supplier relationships

$$ strategic alliances, coopetition, joint ventures, buyer$-$ supplier relationship