Question: display graphs side by side with multiple curves by changing different parameters

Greetings, any one help  me to remove the error  in plots display,here is the codes 

i want 2 rows and 2 columns graphs with 9 lines in each graphs. 

i am attaching the maple questions also  like this i want 

 https://www.mapleprimes.com/questions/224443-How-Do-I-Get-A-Legend-Only-Three-Curves--In-Maple

https://www.mapleprimes.com/questions/225078-How-To-Remove-Error-In-Plot-Display

restart;
 h:=z->1-(delta2/2)*(1 + cos(2*(Pi/L1)*(z - d1 - L1))):
 K1:=((4/h(z)^4)-(sin(alpha)/Gamma2)-h(z)^2+Nb*h(z)^4):
 lambda:=unapply(Int(K1,z=0..1), Gamma2):
 L1:=0.2:
 
 alpha:=Pi/6:
 with(plots):
 display
  ( Vector[row]
    ([seq [ seq
        ( plot
          ( [ seq
              ( eval(lambda(Gamma2), Nb=j),
                j in [0.1,0.2,0.3]
              )
           d1 in [0.1,0.2,0.5])] ],
            delta2=0.02..0.1,
            legend=[Nb=0.1,Nb=0.2,Nb=0.3],
            labels=[typeset(`δ1`), typeset(conjugate(`Δp`))],
            title=typeset("Effect of ", ''alpha'', " when ", Gamma,"2=", Gamma2)
          ),
          Gamma2 in [10,20,30,40]
        )
      ]
    )
  );