'sis' used in million biggest domains list by Alexa.com:
ssisurveys.comsistrix.com
thisis50.com
vipsister23.com
mathsisfun.com
thisiscolossal.com
'sis' used in other domains:
ergosistemas.comisissigma.com
architectsmississippi.com
championsisters.com
elyosis.com
thisisram.com
Statistical data
"sis" has the frequency of use of 0.0006% on city-data.com forum
"sis" has the frequency of use of 0.0001% on en.wikipedia.org.
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