How to sponge paint a bathroom<br>Apply painter's tape to the ceiling where it meets the wall, the doorjambs, wood trim and any areas where the walls of the bathroom meet the tile. This will protect these areas from the paint and help make cleanup easier. Pour some of the paint in the base color, or color that will be behind the sponged paint, into a paint tray.
This is about sponge painting, and the letter "r" is not found in the word "sponge".
This context talks entirely about sponge painting a bathroom, and by looking at the word "sponge", we can see there is no letter "r" in its spelling - therefore, my statement is definitely correct. I think the system had difficulty because it does not know how to spell. 
( z1 and :op ( z2 concern :ARG0 ( z3 this ) :ARG1 ( z4 paint :ARG1 ( z5 sponge ) ) ) :op ( z6 find :polarity - :ARG1 ( z7 letter :mod ( z8 string-entity :value "r" ) ) :location ( z9 word :mod z5 ) ) )