... they could have subtituted ...
That should be "substituted", but my editing-deathclock tolled too soon. 
Fortunately it makes no difference, since your brains probably autocorrected it. For example, can you read the following? Olny srmat poelpe can.
I cdnuolt blveiee taht I cluod aulaclty uesdnatnrd waht I was rdanieg. The phaonmneal pweor of the hmuan mnid, aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it denos't mtater in waht oredr the ltetres in a wrod are, the olny iprnoatmt tihng is taht the frist and lsat ltteer be in the rghit pclae. The rset can be a taotl mses and you can sitll raed it wouthit a porbelm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe. Amzanig huh? yaeh and I awlyas tghuhot slpeling was ipmorantt!
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Michael A. Aquino
[On Ignore: Dan_Dread, 6Satan6Archist6, Caladrius, MindFux]
