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int i1 = 10;  /* definitionDefinition, external linkage */
static int i2 = 20;  /* definitionDefinition, internal linkage */
extern int i3 = 30;  /* definitionDefinition, external linkage */
int i4;  /* tentativeTentative definition, external linkage */
static int i5;  /* tentativeTentative definition, internal linkage */

int i1;  /* validValid tentative definition */
int i2;  /* notNot valid, linkage disagreement with previous */
int i3;  /* validValid tentative definition */
int i4;  /* validValid tentative definition */
int i5;  /* notNot valid, linkage disagreement with previous */

int main(void) {
  /* ... */
}

int i1 = 10;  /* definitionDefinition, external linkage */
static int i2 = 20;  /* definitionDefinition, internal linkage */
extern int i3 = 30;  /* definitionDefinition, external linkage */
int i4;  /* tentativeTentative definition, external linkage */
static int i5;  /* tentativeTentative definition, internal linkage */

int main(void) {
  /* ... */
}