## Solution to: Alien Alert

Yes, all individuals can reach the other planet! Consider the following abbreviations for the individuals:

• F = Federation Officer
• A = alien that can fly the space ship
• a = alien that cannot fly the space ship

Then the flight schedule to reach the other planet is the following:

planet 1          flight          planet 2

F F F A a a
-- A a -->
F F F a                           A a
<-- A ----
F F F A a                         A a
-- A a -->
F F F                             A a a
<-- A ----
F F F A                           a a
-- F F -->
F A                               F F a a
<-- F a --
F F A a                           F a
-- F A -->
F a                               F F A a
<-- F a --
F F a a                           F A
-- F F -->
a a                               F F F A
<-- A ----
A a a                             F F F
-- A a -->
a                                 F F F A a
<-- A ----
A a                               F F F a
-- A a -->
F F F A a a

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