size of desc1 =  2
desc1[0] =  X
desc1[1] =  Y
desc2[0] =  a
desc2[1] =  b
desc3[0] =  X
desc3[1] =  Y
desc1 =  [X,Y]
desc4 =  [A,B,C]
desc5 =  [U,I,O,P]
desc5[0,4] = U
desc5[1,4] = I
desc5[2,4] = O
desc5[3,4] = P
desc6[2] =  S3
desc6[1:3] =  [S2,S3]
desc6[:] =  [S1,S2,S3,S4,S5]
desc6 =  [S1,88,99,S4,S5]
desc7 =  [forunicode,r2,n3]
True
False
False
True
