我有一个DataFrame：
gfortran -c -O3 -ffree-line-length-0 subcode0.f90 -o subcode0.o
gfortran -c -O3 -ffree-line-length-0 mytecio.f90 -o mytecio.o
gfortran -c -O3 -ffree-line-length-0 dislin.f90 -o dislin.o
gfortran -c -O3 -ffree-line-length-0 subcode1.f90 -o subcode1.o
gfortran -c -O3 -ffree-line-length-0 subcode2.f90 -o subcode2.o
gfortran -c -O3 -ffree-line-length-0 subcode3.f90 -o subcode3.o
gfortran -c -O3 -ffree-line-length-0 subcode4.f90 -o subcode4.o
gfortran -c -O3 -ffree-line-length-0 subcode5.f90 -o subcode5.o
gfortran -c -O3 -ffree-line-length-0 subcode6.f90 -o subcode6.o
gfortran -c -O3 -ffree-line-length-0 subcode7.f90 -o subcode7.o
gfortran -c -O3 -ffree-line-length-0 subcode8.f90 -o subcode8.o
gfortran -c -O3 -ffree-line-length-0 supplement01.f90 -o supplement01.o
gfortran -c -O3 -ffree-line-length-0 supplement02.f90 -o supplement02.o
gfortran -c -O3 -ffree-line-length-0 inpred.f90 -o inpred.o
gfortran -O3 -ffree-line-length-0 subcode0.o mytecio.o dislin.o subcode1.o subcode2.o subcode3.o subcode4.o subcode5.o subcode6.o subcode7.o subcode8.o supplement01.o supplement02.o inpred.o -o penmshxp -L/usr/local/lib -ldislin
dyld: Symbol not found: _XtStrings
Referenced from: /usr/local/lib/libdislin.11.dylib
Expected in: flat namespace
Abort trap: 6
我想检查+-----+---------------+
|thing| things|
+-----+---------------+
| foo|[foo, bar, baz]|
| bar| [foo, baz]|
| baz| [baz]|
+-----+---------------+
中是否有thing，即预期输出应为：
things我该怎么做？