In a medium saucepan, bring 1 1/3 cups water to a boil. Add rice, and stir. Reduce heat, cover, and simmer for 20 minutes. In a small bowl, mix the rice vinegar, sugar ,and salt. Blend the mixture into the rice.
Preheat oven to 300 degrees F (150 degrees C). On a medium baking sheet, heat nori in the preheated oven 1 to 2 minutes, until warm.
Center one sheet nori on a bamboo sushi mat. Wet your hands. Using your hands, spread a thin layer of rice on the sheet of nori, and press into a thin layer. Arrange 1/4 of the cucumber, ginger, avocado, and imitation crabmeat in a line down the center of the rice. Lift the end of the mat, and gently roll it over the ingredients, pressing gently. Roll it forward to make a complete roll.Repeat with remaining ingredients.
Cut each roll into 4 to 6 slices using a wet, sharp knife.
If you do not have a bamboo sushi mat, the easiest way to roll the sushi is to use a clean dish towel.
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