How many 2 letter words can you make from THIS?

There are 6 valid 2-letter words that can be made from the letters THIS, and the highest scoring is hi at 5 points.

6 2 letter words from this

You can make 6 words of exactly 2 letters from THIS. The highest scoring is hi at 5 points.

hi: a state in the United States in the central Pacific on the Hawaiian Islands
it: the branch of engineering that deals with the use of computers and telecommunications to retrieve and store and transmit information
si: a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela)
ti: a light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite