"2016-Aug-18 Calculated with Mathematica using Marelli's Facebook word frequencies per billion"
"2016-Aug-18 Calculated with Mathematica using SUBLEX frequency count per 51 million"
"Added bigram frequencies calculated in Mathematica using SUBLEX and Marelli's Facebook word frequencies"
Jones & Mewhort (2004) Case-sensitive letter and bigram frequency counds from large-scale English corpora. Behavior research methods, instruments, & computers, 36(3) 388-396.
Bigram frequencies from Table A3 of http://www.queensu.ca/psychology/hiplab/Publications/Recentpublications/Mewhort_RP_15.pdf