test.plof: Added (slightly) more interesting test cases and made sure none of the strings printed are of valid wordlengths (so they're never printed as numbers)
test.plof: Added (slightly) more interesting test cases and made sure none of the strings printed are of valid wordlengths (so they're never printed as numbers)

GregorR/plof3,GregorR/plof3,GregorR/plof3,GregorR/plof3