sources/0505_loop_rel2.c:4.2-5.2: [|x=0; -N+1000>=0; N-1>=0|]
sources/0505_loop_rel2.c:4.2-5.2: [|-N+1000>=0; -x+3>=0; x>=0; N-x-1>=0|]
sources/0505_loop_rel2.c:4.2-5.2: [|-N+1000>=0; -x+6>=0; x>=0; N-x-1>=0|]
sources/0505_loop_rel2.c:4.2-5.2: [|-N+1000>=0; x>=0; N-x-1>=0|]
Output: [|-N+1000>=0; -N+x>=0; N-x+2>=0; 3N-x>=0|]