what is the output ?

What is the output if num = 1 ? 
#include <stdio.h>

int main() {

        int i = 1;

        switch(i % 10) {
                case 1 : printf ("one \n");
                case 2 : printf ("two \n");
                case 3 : printf ("three \n");
        }
        return 0;

}

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