be careful that you have to add that 1 only if you are choosing the words manually by looking at that list, as in (1207=1208th word).
but you never do that ...
OP wants to manually choose his own words... so that is EXACTLY what he is trying to do but you never do that ...
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... since you would be using a programming language and these words are placed in an array and AFAIK in all language arrays start from index 0.
While most of the popular languages do index from 0, off the top of my head LUA and XPath/XQuery both index from 1. Turns out there are also a few others... (refer: "Default Base Index" column)