tasks solved in Racket but not in Tcl

$ diff tcl rkt|grep '^>'
>     Abundant, deficient and perfect number classifications
>     Aliquot sequence classifications
>     Bilinear interpolation
>     Boids simulation
>     Calculate International Securities Identification Number
>     Circle sort
>     Commatizing numbers
>     Constrained genericity
>     Create an object/Native demonstration
>     User:DanBron/Game of Nim
>     Dice game probabilities
>     Euler's sum of powers conjecture
>     Find palindromic numbers in both binary and ternary bases
>     Free polyominoes enumeration
>     Function prototype
>     Example:Hough transform/Racket
>     I.Q. Puzzle
>     Kahan summation
>     Longest common prefix
>     Longest Common Substring
>     Native shebang
>     Nonogram solver
>     Old Russian measure of length
>     Parametric polymorphism
>     Pentagram
>     Perfect shuffle
>     Primes - allocate descendants to their ancestors
>     Readline interface
>     Sailors, coconuts and a monkey problem
>     Solve a Numbrix puzzle
>     Sorting algorithms/Tree sort on a linked list
>     Subleq
>     Suffix tree
>     Terminal control/Positional read
>     Textonyms
>     Time-based One-time Password Algorithm
>     Tokenize a string with escaping
>     Topic variable
>     Topological sort/Extracted top item
>     Example:Total circles area/Racket
>     Ulam spiral (for primes)
>     Vector
>     VList