# Test case 1; {{a:0},{b:1},{c:2},{d:3},{e:4},{f:5}}
{f{a}{e{c{b}}{d}}}
{{0:5}{1:0}{2:4}{3:2}{4:1}{5:3}}
# Test case 2; {{a:0},{b:1},{c:4},{d:2},{e:3},{f:5}}
{f{a}{c{e{b}{d}}}}
{{0:5}{1:0}{2:4}{3:3}{4:1}{5:2}}
# Test case 35; {{a:0,1,2,3}}
{a{a{a}{a}}}
{{0:0,1,2,3}}