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$ echo roygbiv | tr -d "\n" | wc -m
$ echo roygbiv | perl -e '$a=<STDIN>;chomp $a;printf "There are %d col
+ors in the rainbow.\n",length $a'
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
Results (176 votes),