The Vol.4,2025 of International J.Mathematical Combinatorics is released today by AMCA. In this issue, there are 7 paper published including:

Paper 1. On the Application of Separable $R_0R_1R_2\cdots R_a$-Cyclic DNA Codes to DNAComputing, By Yasemin Cengellenmis and Abdullah Dertli

Paper 2. Obstructions for Connected Tree-width and Connected Path-width, By Takaaki Fujita

Paper 3. Enumeration the Number of Spanning Trees of Some Families of Graphs Based on Nonahedron Graphs,  By S. N. Daoud and  Ahmed N. Elsawy

Paper 4. Common fixed Point Results for Interpolative Reich--Rus--\'{C}iri\'{c}--Meir--Keeler  Contractions, By Jaynendra Shrivas and Rohit Kumar Verma 

Paper 5. Group Divisible Designs $(5, n, n+1, 4; \lambda_{1}, \lambda_{2})$,By Didas Ngabirano, Kasifa Namyalo and Olivia Nabawanda

Paper 6. Hyperfloorplans and Superhyperfloorplans--Definitions, Properties and  Perspectives (Revisit)  By Takaaki Fujita 

Paper 7. Quantitative Mathematical Analysis of Agricultural Chemicals: Impacts on Soil, Health and Biodiversity, By Ram Milan Singh

Now, all papers in this issue can be download freely in the website www.mathcombin.com of Academy of Mathematical 

Combinatorica & Applications (AMCA, USA).