[PATCH] few typo fixes to src/en/book/ch07.xml

[Kamesh Jayachandran]

Find the patch attached.

With regards
Kamesh Jayachandran

[[[
   Typo fixes.

Patch by: Kamesh Jayachandran <kamesh at collab.net>

  * src/en/book/ch07.xml
    'a' in place of 'an' before 'hint' and 'unique'.
    can travalled to 'can be travelled'.
]]]


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