Unable to solve the collocation equations
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global phi rhos rhof cps cpf ks kf Pr lambda l Bv Bt Ec Hs gamma Q A1 eta
f=[
y(2);
y(3);
lambda*y(2)-(1-phi)^2.5*(1-phi+phi*(rhos/rhof))*(y(1)*y(3)-y(2)^2)-(1-phi)^2.5*(Q*exp(-A1*eta)+l*Bv*(y(7)-y(2)));
y(5);
(kf/((ks+2*kf-2*phi*(kf-ks))*kf)/(ks+2*kf+2*phi*(kf-ks)))*Pr*((1-phi+phi*(rhos*cps/rhof*cpf))*y(1)*y(5)-l*Bt*(y(8)-y(4)-l*Bv*Ec*(y(7)-y(2)-Hs*y(4))));
y(7);
y(7)^2-Bv*(y(2)-y(7))/y(6);
-gamma*Bt*(y(4)-y(8))/y(6);
];
res=[ya(1), ya(2)-1,ya(4)-1,yb(2), yb(4), yb(6)-yb(4), yb(7), yb(8)];
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