A  ¹⁷ I did not go up to Jerusalem to those who were apostles before me; 

B  but I went to Arabia, and returned again to Damascus. ¹⁸ Then after three years 

A’  I went up to Jerusalem to see Peter, and remained with him fifteen days. ¹⁹ But I saw none of the other apostles except James, the Lord’s brother. 

A: Jerusalem, Not Going, then Going.
B: Three Years in Arabia and Damascus (mirroring the 3-yr. ministry of Jesus with His disciples).