This is cutadapt 2.8 with Python 3.7.4 Command line parameters: -a C{9} -m 20 -o TP1.trim.fastq TP1.fastq Processing reads on 1 core in single-end mode ... Finished in 0.61 s (28 us/read; 2.14 M reads/minute). === Summary === Total reads processed: 21,652 Reads with adapters: 2,391 (11.0%) Reads that were too short: 182 (0.8%) Reads written (passing filters): 21,470 (99.2%) Total basepairs processed: 1,320,772 bp Total written (filtered): 1,275,101 bp (96.5%) === Adapter 1 === Sequence: CCCCCCCCC; Type: regular 3'; Length: 9; Trimmed: 2391 times; Reverse-complemented: 0 times No. of allowed errors: 0-9 bp: 0 Bases preceding removed adapters: A: 50.5% C: 0.0% G: 17.4% T: 31.9% none/other: 0.3% Overview of removed sequences length count expect max.err error counts 3 308 338.3 0 308 4 133 84.6 0 133 5 124 21.1 0 124 6 106 5.3 0 106 7 71 1.3 0 71 8 82 0.3 0 82 9 59 0.1 0 59 10 61 0.1 0 61 11 60 0.1 0 60 12 56 0.1 0 56 13 72 0.1 0 72 14 48 0.1 0 48 15 50 0.1 0 50 16 60 0.1 0 60 17 52 0.1 0 52 18 53 0.1 0 53 19 45 0.1 0 45 20 53 0.1 0 53 21 35 0.1 0 35 22 53 0.1 0 53 23 49 0.1 0 49 24 41 0.1 0 41 25 41 0.1 0 41 26 37 0.1 0 37 27 36 0.1 0 36 28 43 0.1 0 43 29 36 0.1 0 36 30 39 0.1 0 39 31 37 0.1 0 37 32 44 0.1 0 44 33 38 0.1 0 38 34 24 0.1 0 24 35 36 0.1 0 36 36 21 0.1 0 21 37 22 0.1 0 22 38 25 0.1 0 25 39 17 0.1 0 17 40 19 0.1 0 19 41 23 0.1 0 23 42 26 0.1 0 26 43 16 0.1 0 16 44 15 0.1 0 15 45 18 0.1 0 18 46 13 0.1 0 13 47 20 0.1 0 20 48 7 0.1 0 7 49 14 0.1 0 14 50 13 0.1 0 13 51 6 0.1 0 6 52 10 0.1 0 10 53 5 0.1 0 5 54 3 0.1 0 3 55 4 0.1 0 4 56 2 0.1 0 2 57 2 0.1 0 2 58 1 0.1 0 1 59 1 0.1 0 1 61 6 0.1 0 6