BBasis[18,{18}] =
{Graph[C1[37], C1[38], C1[39], C1[41], C1[40], C1[43], C1[42], C1[45], 
   C1[44], C1[47], C1[46], C1[49], C1[48], C1[51], C1[50], C1[54], C1[53], 
   C1[52], Dashed[37, 39], Dashed[37, 38], Dashed[39, 41], Dashed[38, 40], 
   Dashed[41, 43], Dashed[40, 42], Dashed[43, 45], Dashed[42, 44], 
   Dashed[45, 47], Dashed[44, 46], Dashed[47, 49], Dashed[46, 48], 
   Dashed[49, 51], Dashed[48, 50], Dashed[51, 53], Dashed[50, 52], 
   Dashed[53, 54], Dashed[52, 54], OV[1, 19, 20], OV[2, 20, 22], 
   OV[3, 19, 21], OV[5, 22, 24], OV[4, 21, 23], OV[7, 24, 26], OV[6, 23, 25], 
   OV[9, 26, 28], OV[8, 25, 27], OV[11, 28, 30], OV[10, 27, 29], 
   OV[13, 30, 32], OV[12, 29, 31], OV[15, 32, 34], OV[14, 31, 33], 
   OV[18, 34, 36], OV[17, 33, 35], OV[16, 35, 36]]}