Dave Eisen
United States
Menlo Park
CA
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Re:Founding a colony - permissable to abort?
It does say must, which on first glance is dispositive.
But in the Rio Grande version of the rules, the last paragraph on that page includes the sentence:
"It is also possible for a player to have enough colonist cards in his hand to found the colony, but he decides he does not want to use the number required."
You are free to abort.