文頭の小文字

n-gram (Wikipedia)
"An n-gram model is a type of probabilistic language model for predicting the next item in such a sequence in the form of a (n − 1)–order Markov model.^[2] n-gram（＊文頭小文字；"N-gram"とする必要性は無いのか？）models are now widely used in probability, communication theory, computational linguistics (for instance, statistical natural language processing), computational biology (for instance, biological sequence analysis), and data compression. Two benefits of n-gram models (and algorithms that use them) are simplicity and scalability – with larger n, a model can store more context with a well-understood space–time tradeoff, enabling small experiments to scale up efficiently."

追記28JUNE2017
Capitalization Rules
"If a trademark starts with a lowercase word or letter (e.g., eBay, iPhone), many authorities advise capitalizing it to begin a sentence.

 

Example: EBay opened strong in trading today."

文頭の数はスペルアウトするか、文の構成を変える。(English Language & Usage)